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gh-95914: Add paragraph about PEP 654 in main body of 'What's New in 3.11' (GH-95937)

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Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
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@ -175,8 +175,25 @@ The :option:`-X` ``no_debug_ranges`` option and the environment variable
See :pep:`657` for more details. (Contributed by Pablo Galindo, Batuhan Taskaya
and Ammar Askar in :issue:`43950`.)
Exceptions can be enriched with notes (PEP 678)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PEP 654: Exception Groups and ``except*``
-----------------------------------------
:pep:`654` introduces language features that enable a program
to raise and handle multiple unrelated exceptions simultaneously.
The builtin types :exc:`ExceptionGroup` and :exc:`BaseExceptionGroup`
make it possible to group exceptions and raise them together,
and the new :keyword:`except* <except_star>` syntax generalizes
:keyword:`except` to match subgroups of exception groups.
See :pep:`654` for more details.
(Contributed by Irit Katriel in :issue:`45292`. PEP written by
Irit Katriel, Yury Selivanov and Guido van Rossum.)
PEP 678: Exceptions can be enriched with notes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The :meth:`add_note` method was added to :exc:`BaseException`. It can be
used to enrich exceptions with context information which is not available