Fix spelling typos in docs, source, and tests

[mr-raj12]

Found spelling typos across the codebase using codespell.

Files affected: 16 (docs, source, tests)
Nature of changes: Comments, docstrings, documentation, and one test variable rename — no functional code changes.

File	Typo → Fix
CHANGELOG.rst	pacge → package, enviroment → environment
aboutcode/federated/README.rst	traditionale → traditional
aboutcode/federated/__init__.py	loosing → losing, the the → the
docs/source/installation.rst	recommendend → recommended
docs/source/reference_importer_overview.rst	vulnerabilites → vulnerabilities (×2)
docs/source/reference_improver_overview.rst	vulnerabilites → vulnerabilities (×4)
docs/source/tutorial_add_importer_pipeline.rst	exmaple → example
docs/source/tutorial_add_improver_pipeline.rst	exmaple → example (×2)
vulnerabilities/import_runner.py	vulnerabilitiy → vulnerability
vulnerabilities/improve_runner.py	vulnerabilitiy → vulnerability
vulnerabilities/models.py	the the → the
vulnerabilities/pipelines/nvd_importer.py	retun → return, summry → summary
vulnerabilities/pipelines/v2_importers/nvd_importer.py	retun → return, summry → summary
vulnerabilities/tests/pipelines/test_nginx_importer_pipeline.py	reponse_files → response_files (variable rename, ×2)
vulnerabilities/utils.py	the the → the
vulnerabilities/views.py	in the forward → in the future