[3.15] gh-150319: Replace all documentation which says "See PEP 585" (GH-150325)

[miss-islington]

• Replace all documentation which says "See PEP 585"

The following classes in the stdlib get simple updates:

• array.array
• asyncio.Future
• asyncio.Task
• collections.defaultdict
• collections.deque
• contextvars.ContextVar
• contextvars.Token
• ctypes.Array
• os.DirEntry
• re.Match
• re.Pattern
• string.templatelib.Interpolation
• string.templatelib.Template
• types.MappingProxyType
• queue.SimpleQueue
• weakref.ref

The following classes are documented publicly as functions, and are
therefore updated internally (__class_getitem__.__doc__) but not in the
public docs:

• functools.partial
• itertools.chain

The following builtin types have updates to __class_getitem__.__doc__
but not to any documentation pages:

• BaseExceptionGroup
• coroutines (from generators)
• dict
• enumerate
• frozendict
• frozenset
• generators (and async generators)
• list
• memoryview
• set
• slice
• tuple

Special cases:

• union objects are now documented as "supporting class-level []",
  rather than anything to do with generics.

• Templates might be generic over a single type (union, in theory) or
  over a TypeVarTuple. As this is not currently fully settled, it is
  marked with a comment and a mild hint that it is a single type is used
  (namely, "type" is singular rather than "types", plural)

• Apply suggestions from code review

Co-authored-by: Jelle Zijlstra jelle.zijlstra@gmail.com

• Correct several class getitem docs

And expand the text for tuples.

Co-authored-by: Jelle Zijlstra 906600+JelleZijlstra@users.noreply.github.com

• Add notes on generic typing of builtins

• Fix typo in tuple.class_getitem docstring

• Typo fix: malformed refs

Fix generic links which weren't marked as :ref:.

• Strike unnecessary docs on generic-ness

Co-authored-by: Jelle Zijlstra 906600+JelleZijlstra@users.noreply.github.com

• Apply suggestions from code review

These are applied at both the originally indicated locations and in the
corresponding docstring definitions.

Co-authored-by: Alex Waygood 66076021+AlexWaygood@users.noreply.github.com

• Update Doc/library/re.rst

Co-authored-by: Alex Waygood Alex.Waygood@Gmail.com

• Update Objects/enumobject.c

Co-authored-by: Alex Waygood Alex.Waygood@Gmail.com

• Remove tuple generic doc in 'stdtypes' page

This is covered in more detail in the cross-linked typing documentation.
The other copy of this documentation -- in the docstring for
tuple.__class_getitem__ -- is left in place.

• Fix whitespace around new doc of generics

Per review, do not introduce or remove whitespace such that section
breaks are altered by the introduction of doc on various generic types.

In most cases, this is a removal of an extra line.

In one case (Arrays), it is the reintroduction of a line.

Additionally, two other minor fixes are included:

• incorrect indent on 'defaultdicts'
• make mappingproxy.__class_getitem__.__doc__ consistent with other
  mapping type generic docs

Co-authored-by: Bénédikt Tran 10796600+picnixz@users.noreply.github.com

• Move placement of memoryview generic note

Previous placement was at the end of the main docstring, which is
consistent with other types but places it after a section on various
methods (which makes it read somewhat inconsistently). Moving it up
helps resolve.

Co-authored-by: Bénédikt Tran 10796600+picnixz@users.noreply.github.com

• Ensure sphinxdoc does not start sentences lowercase

Lowercase class names at the start of sentences are marked out with the
class role. In the case of deque, documentation already refers to
these as Deques, so this form is preferred.

• Apply suggestions from code review

Co-authored-by: Bénédikt Tran 10796600+picnixz@users.noreply.github.com

• Fix line endings and wrap more tightly

Line endings fixed by pre-commit ; also re-wrapped the MappingProxyType
text which was too long.

• Use 'ContextVars' style in sphinx doc

---

(cherry picked from commit 50fe49c)

Co-authored-by: Stephen Rosen sirosen@globus.org
Co-authored-by: Jelle Zijlstra jelle.zijlstra@gmail.com
Co-authored-by: Jelle Zijlstra 906600+JelleZijlstra@users.noreply.github.com
Co-authored-by: Alex Waygood 66076021+AlexWaygood@users.noreply.github.com
Co-authored-by: Alex Waygood Alex.Waygood@Gmail.com
Co-authored-by: Bénédikt Tran 10796600+picnixz@users.noreply.github.com

• Issue: Document generic parameters of generic classes #150319