[issue42198] Clean up docs for Union and GenericAlias

[Ken Jin]

New submission from Ken Jin <kenjin4096 at gmail.com>:

This is an umbrella issue to clean up docs for Union and GenericAlias. To-do (not in order):

1. Update links in typing, subscription and union to point to GenericAlias.

2. Park GenericAlias and Union under a new section 'Type Annotation Types' in stdtypes for 3.10. The reason is to follow with the rest of the stdtypes' doc convention.

3. Consistency nitpicks for Union's docs.

----------
assignee: docs at python
components: Documentation
messages: 379876
nosy: docs at python, gvanrossum, kj
priority: normal
severity: normal
status: open
title: Clean up docs for Union and GenericAlias
versions: Python 3.10, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42198>
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