gh-105578: Deprecate AnyStr in the docs

[michael-the1]

Deprecate AnyStr in the docs.

• Issue: Discourage and deprecate typing.AnyStr #105578

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📚 Documentation preview 📚: https://cpython-previews--107116.org.readthedocs.build/

[AlexWaygood]

Thank you!

This also needs:

• A news entry
• An entry in "What's New in Python 3.13

The deprecation notice also needs to state:

• That we intend to remove it from __all__ and start emitting deprecation warnings at runtime in Python 3.16
• That we plan to remove it in Python 3.18

[AlexWaygood]

Nearly there! Could you also add a row to the big deprecations table at the bottom of the typing docs: https://docs.python.org/3.13/library/typing.html#deprecation-timeline-of-major-features

[AlexWaygood]

A few suggestions to add some links to https://docs.python.org/3.13/reference/compound_stmts.html#type-params

Some of these are a bit repetitive, but it's important that people see notices about upcoming removals, so it's actually a good thing if we're saying the same thing in lots of places :-)

[AlexWaygood]

Thank you, looks great!