error on query symbols with special characters.

[ZachVec]

I add some debug code to output the requested url for `std::literals::chrono_literals::operator""d`, which is `https://en.cppreference.com/w/cpp/chrono/operator%22%22d`. However, the actual url should be `https://en.cppreference.com/w/cpp/chrono/operator%2522%2522d.html`.

And following cases have the similar issue:

• std::experimental::observer_ptr::operator*
• std::experimental::observer_ptr::operator->
• And many others.

It seems there's a url-encoding gap between cppreference and cppman.

[ZachVec]

Maybe the following records should be fixed in index.db.

    # (primary key, url)
    fixes = [
        ("479", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522d"),
        ("481", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522h"),
        ("483", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522ns"),
        ("486", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522s"),
        ("488", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522min"),
        ("489", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522ms"),
        ("526", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522us"),
        ("527", "https://en.cppreference.com/w/cpp/chrono/operator%2522%2522y"),
        (
            "1413",
            "https://en.cppreference.com/w/cpp/experimental/observer_ptr/operator%252A.html",
        ),
        (
            "1420",
            "https://en.cppreference.com/w/cpp/experimental/ostream_joiner/operator%252A.html",
        ),
        (
            "1445",
            "https://en.cppreference.com/w/cpp/experimental/propagate_const/operator%252A.html",
        ),
        (
            "1447",
            "https://en.cppreference.com/w/cpp/experimental/propagate_const/operator_element_type%252A.html",
        ),
        (
            "1545",
            "https://en.cppreference.com/w/cpp/experimental/unique_resource/operator%252A.html",
        ),
        ("2144", "https://en.cppreference.com/w/cpp/language/as_operator.html"),
        ("2256", "https://en.cppreference.com/w/cpp/language/parameter_pack.html"),
        ("2395", "https://en.cppreference.com/w/cpp/memory/new/destroying_delete_t"),
        (
            "2543",
            "https://en.cppreference.com/w/cpp/numeric/complex/operator%2522%2522i.html",
        ),
        ("2899", "https://en.cppreference.com/w/cpp/ranges/cpo.html"),
        (
            "2942",
            "https://en.cppreference.com/w/cpp/string/basic_string/operator%2522%2522s.html",
        ),
        (
            "3030",
            "https://en.cppreference.com/w/cpp/string/basic_string_view/operator%2522%2522sv.html",
        ),
        (
            "3505",
            "https://en.cppreference.com/w/cpp/utility/expected/operator%252A.html",
        ),
        (
            "3613",
            "https://en.cppreference.com/w/cpp/utility/optional/operator%252A.html",
        ),
        (
            "4208",
            "https://en.cppreference.com/w/cpp/experimental/optional/operator%252A.html",
        ),
        (
            "4343",
            "https://en.cppreference.com/w/cpp/experimental/shared_ptr/operator%252A.html",
        ),
        (
            "4414",
            "https://en.cppreference.com/w/cpp/filesystem/directory_iterator/operator%252A.html",
        ),
        (
            "4504",
            "https://en.cppreference.com/w/cpp/filesystem/recursive_directory_iterator/operator%252A.html",
        ),
        (
            "4682",
            "https://en.cppreference.com/w/cpp/iterator/back_insert_iterator/operator%252A.html",
        ),
        (
            "4689",
            "https://en.cppreference.com/w/cpp/iterator/basic_const_iterator/operator%252A.html",
        ),
        (
            "4716",
            "https://en.cppreference.com/w/cpp/iterator/counted_iterator/operator%252A.html",
        ),
        (
            "4725",
            "https://en.cppreference.com/w/cpp/iterator/front_insert_iterator/operator%252A.html",
        ),
        (
            "4728",
            "https://en.cppreference.com/w/cpp/iterator/insert_iterator/operator%252A.html",
        ),
        (
            "4732",
            "https://en.cppreference.com/w/cpp/iterator/istreambuf_iterator/operator%252A.html",
        ),
        (
            "4733",
            "https://en.cppreference.com/w/cpp/iterator/istream_iterator/operator%252A.html",
        ),
        (
            "4737",
            "https://en.cppreference.com/w/cpp/iterator/common_iterator/operator%252A.html",
        ),
        (
            "4760",
            "https://en.cppreference.com/w/cpp/iterator/ostream_iterator/operator%252A.html",
        ),
        (
            "4767",
            "https://en.cppreference.com/w/cpp/iterator/ostreambuf_iterator/operator%252A.html",
        ),
        (
            "4768",
            "https://en.cppreference.com/w/cpp/iterator/reverse_iterator/operator%252A.html",
        ),
        (
            "4769",
            "https://en.cppreference.com/w/cpp/iterator/reverse_iterator/operator++",
        ),
        (
            "4779",
            "https://en.cppreference.com/w/cpp/iterator/move_iterator/operator%252A.html",
        ),
        (
            "4887",
            "https://en.cppreference.com/w/cpp/memory/auto_ptr/operator%252A.html",
        ),
        (
            "4898",
            "https://en.cppreference.com/w/cpp/memory/indirect/operator%252A.html",
        ),
        (
            "4941",
            "https://en.cppreference.com/w/cpp/memory/raw_storage_iterator/operator%252A.html",
        ),
        (
            "4993",
            "https://en.cppreference.com/w/cpp/memory/unique_ptr/operator%252A.html",
        ),
        (
            "5001",
            "https://en.cppreference.com/w/cpp/memory/shared_ptr/operator%252A.html",
        ),
        (
            "5307",
            "https://en.cppreference.com/w/cpp/ranges/adjacent_transform_view/iterator/operator%252A.html",
        ),
        (
            "5323",
            "https://en.cppreference.com/w/cpp/ranges/adjacent_view/iterator/operator%252A.html",
        ),
        (
            "5345",
            "https://en.cppreference.com/w/cpp/ranges/chunk_by_view/iterator/operator%252A.html",
        ),
        (
            "5355",
            "https://en.cppreference.com/w/cpp/ranges/cartesian_product_view/iterator/operator%252A.html",
        ),
        (
            "5364",
            "https://en.cppreference.com/w/cpp/ranges/chunk_view/inner_iterator/operator%252A.html",
        ),
        (
            "5367",
            "https://en.cppreference.com/w/cpp/ranges/chunk_view/iterator/operator%252A.html",
        ),
        (
            "5391",
            "https://en.cppreference.com/w/cpp/ranges/chunk_view/outer_iterator/operator%252A.html",
        ),
        (
            "5420",
            "https://en.cppreference.com/w/cpp/ranges/elements_view/iterator/operator%252A.html",
        ),
        (
            "5435",
            "https://en.cppreference.com/w/cpp/ranges/concat_view/iterator/operator%252A.html",
        ),
        (
            "5471",
            "https://en.cppreference.com/w/cpp/ranges/join_view/iterator/operator%252A.html",
        ),
        (
            "5481",
            "https://en.cppreference.com/w/cpp/ranges/enumerate_view/iterator/operator%252A.html",
        ),
        (
            "5493",
            "https://en.cppreference.com/w/cpp/ranges/join_with_view/iterator/operator%252A.html",
        ),
        (
            "5515",
            "https://en.cppreference.com/w/cpp/ranges/slide_view/iterator/operator%252A.html",
        ),
        (
            "5563",
            "https://en.cppreference.com/w/cpp/ranges/stride_view/iterator/operator%252A.html",
        ),
        (
            "5590",
            "https://en.cppreference.com/w/cpp/ranges/transform_view/iterator/operator%252A.html",
        ),
        (
            "5613",
            "https://en.cppreference.com/w/cpp/ranges/zip_transform_view/iterator/operator%252A.html",
        ),
        (
            "5670",
            "https://en.cppreference.com/w/cpp/regex/regex_token_iterator/operator%252A.html",
        ),
        (
            "5672",
            "https://en.cppreference.com/w/cpp/ranges/zip_view/iterator/operator%252A.html",
        ),
        (
            "5685",
            "https://en.cppreference.com/w/cpp/regex/regex_iterator/operator%252A.html",
        ),
        (
            "5963",
            "https://en.cppreference.com/w/cpp/experimental/fs/directory_iterator/operator%252A.html",
        ),
        (
            "6000",
            "https://en.cppreference.com/w/cpp/experimental/fs/recursive_directory_iterator/operator%252A.html",
        ),
    ]