gh-101100: Fix Sphinx warnings from removed ~! references

[hugovk]

Fix 23 warnings for things like :meth:`~!unittest.TestProgram.usageExit` - the tilde says to render it like usageExit and the exclamation mark says not to look up the reference.

But after deprecations have been removed, Sphinx nevertheless issues a warning. So instead let's switch to :meth:`!usageExit` to show the short version and not look it up. This silences the warning.

Doc/whatsnew/3.11.rst:1863: WARNING: py:meth reference target not found: !unittest.TestProgram.usageExit
Doc/whatsnew/3.3.rst:1055: WARNING: py:func reference target not found: !crypt.mksalt
Doc/whatsnew/3.4.rst:1531: WARNING: py:meth reference target not found: !sunau.getparams
Doc/whatsnew/3.4.rst:1543: WARNING: py:meth reference target not found: !sunau.AU_write.writeframes
Doc/whatsnew/3.4.rst:1543: WARNING: py:meth reference target not found: !sunau.AU_write.writeframesraw
Doc/whatsnew/3.4.rst:608: WARNING: py:meth reference target not found: !aifc.aifc.getparams
Doc/whatsnew/3.4.rst:611: WARNING: py:meth reference target not found: !aifc.aifc.close
Doc/whatsnew/3.4.rst:616: WARNING: py:meth reference target not found: !aifc.aifc.writeframes
Doc/whatsnew/3.4.rst:616: WARNING: py:meth reference target not found: !aifc.aifc.writeframesraw
Doc/whatsnew/3.4.rst:635: WARNING: py:func reference target not found: !audioop.byteswap
Doc/whatsnew/3.5.rst:1255: WARNING: py:func reference target not found: !imghdr.what
Doc/whatsnew/3.7.rst:2006: WARNING: py:meth reference target not found: !importlib.abc.MetaPathFinder.find_module
Doc/whatsnew/3.7.rst:2006: WARNING: py:meth reference target not found: !importlib.abc.PathEntryFinder.find_loader
Doc/whatsnew/3.7.rst:854: WARNING: py:func reference target not found: !crypt.mksalt
Doc/whatsnew/3.9.rst:588: WARNING: py:class reference target not found: !nntplib.NNTP
Doc/whatsnew/3.9.rst:588: WARNING: py:class reference target not found: !nntplib.NNTP_SSL
build/NEWS:10243: WARNING: py:meth reference target not found: !unittest.TestProgram.usageExit
build/NEWS:14046: WARNING: py:func reference target not found: !unittest.findTestCases
build/NEWS:14047: WARNING: py:func reference target not found: !unittest.makeSuite
build/NEWS:14048: WARNING: py:func reference target not found: !unittest.getTestCaseNames
build/NEWS:20562: WARNING: py:class reference target not found: !nntplib.NNTP
build/NEWS:20562: WARNING: py:class reference target not found: !nntplib.NNTP_SSL
build/NEWS:20578: WARNING: py:class reference target not found: !nntplib.NNTP

And for future removals, instead of doing:

-:meth:`~unittest.TestProgram.usageExit`
+:meth:`~!unittest.TestProgram.usageExit`

Let's prefer:

-:meth:`~unittest.TestProgram.usageExit`
+:meth:`!usageExit`

• Issue: Fix all Sphinx reference warnings in the documentation #101100

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📚 Documentation preview 📚: https://cpython-previews--113629.org.readthedocs.build/

[AlexWaygood]

Looks good!

[miss-islington-app]

Thanks @hugovk for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @hugovk, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 7595380347610598a3f5529214a449660892537b 3.12

[miss-islington-app]

Sorry, @hugovk, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 7595380347610598a3f5529214a449660892537b 3.11

[bedevere-app]

GH-113641 is a backport of this pull request to the 3.12 branch.

[bedevere-app]

GH-113642 is a backport of this pull request to the 3.11 branch.