Bug report

Bug description:

The "Related help topics" lists of two help() topics name entries that do not exist:

>>> help('TYPES')
...
Related help topics: STRINGS, UNICODE, NUMBERS, SEQUENCES, MAPPINGS,
FUNCTIONS, CLASSES, MODULES, FILES, inspect

>>> help('FILES')
No help entry found for 'FILES'.
...
>>> help('UNICODE')
...
Related help topics: encodings, unicode, SEQUENCES, STRINGMETHODS,
FORMATTING, TYPES

>>> help('unicode')
No help entry found for 'unicode'.
...

The FILES topic was removed from pydoc.Helper.topics in Python 3.4 because its documentation no longer exists (gh-63118), but the cross-reference from TYPES was kept. unicode refers to the Python 2 built-in type, which does not exist in Python 3.

Every other related topic of the help() topics and keywords is a topic, keyword, symbol, or an object that help() can document, so these two entries can be removed.

CPython versions tested on:

3.12, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-161415: Remove nonexistent related help topics in pydoc #161417