gh-62: Fix TYPE documentation.

Author: python-processing-unit

docs/SPECIFICATION.html

@@ -570,7 +570,7 @@
 
 - `INT: ISTNS(SYMBOL: x)` ; returns `1` if the identifier `x` exists and is of type `TNS`, otherwise returns `0`. The argument MUST be an identifier; supplying any other expression is a runtime error.
 
-- `STR: TYPE(ANY: obj)` ; returns the runtime type name of `obj` as a `STR` - one of `INT`, `FLT`, `STR`, or `TNS` (extension-defined type names are returned unchanged when extensions are enabled).
+- `STR: TYPE(ANY: obj)` ; returns the runtime type name of `obj` as a `STR` - one of `INT`, `FLT`, `STR`, `TNS`, `MAP`, `FUNC`, or `THR` (or `NULL` for null/uninitialized values). Extension-defined type names are returned unchanged when extensions are enabled.
 
 - `STR: SIGNATURE(SYMBOL: sym)` ; returns a textual signature for the identifier `sym`. If `sym` denotes a user-defined function (`FUNC`) the result is formatted in the canonical form used in this specification, for example `R: name(T1: arg1, T2: arg2 = default)`. For other bound symbols the result is `TYPE: symbol` (for example `INT: x`). The argument MUST be a plain identifier.