gh-95914: Add links to 3.11 WhatsNew Summary items (GH-98416)

Add links to Summary items to where readers can learn more
(cherry picked from commit fcae195)

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>

Doc/whatsnew/3.11.rst

@@ -58,44 +58,49 @@ Summary -- Release highlights
 .. This section singles out the most important changes in Python 3.11.
    Brevity is key.
 
-- Python 3.11 is between 10-60% faster than Python 3.10. On average, we measured a
-  1.25x speedup on the standard benchmark suite. See `Faster CPython`_ for details.
+* Python 3.11 is between 10-60% faster than Python 3.10.
+  On average, we measured a 1.25x speedup on the standard benchmark suite.
+  See :ref:`whatsnew311-faster-cpython` for details.
 
 .. PEP-sized items next.
 
 New syntax features:
 
-* :pep:`654`: Exception Groups and ``except*``.
+* :ref:`whatsnew311-pep654`
 
 New built-in features:
 
-* :pep:`678`: Enriching Exceptions with Notes.
+* :ref:`whatsnew311-pep678`
 
 New standard library modules:
 
-* :pep:`680`: ``tomllib`` — Support for Parsing TOML in the Standard Library.
+* :pep:`680`: :mod:`tomllib` —
+  Support for parsing `TOML <https://toml.io/>`_ in the Standard Library
 
 Interpreter improvements:
 
-* :pep:`657`: Include Fine Grained Error Locations in Tracebacks.
+* :ref:`whatsnew311-pep657`
 * New :option:`-P` command line option and :envvar:`PYTHONSAFEPATH` environment
-  variable to disable automatically prepending a potentially unsafe path
-  (the working dir or script directory, depending on invocation)
-  to :data:`sys.path`.
+  variable to :ref:`disable automatically prepending potentially unsafe paths
+  <whatsnew311-pythonsafepath>` to :data:`sys.path`
 
 New typing features:
 
-* :pep:`646`: Variadic generics.
-* :pep:`655`: Marking individual TypedDict items as required or potentially missing.
-* :pep:`673`: ``Self`` type.
-* :pep:`675`: Arbitrary literal string type.
-* :pep:`681`: Data Class Transforms.
+* :ref:`whatsnew311-pep646`
+* :ref:`whatsnew311-pep655`
+* :ref:`whatsnew311-pep673`
+* :ref:`whatsnew311-pep675`
+* :ref:`whatsnew311-pep681`
 
-Important deprecations, removals or restrictions:
+Important deprecations, removals and restrictions:
 
-* :pep:`594`: Removing dead batteries from the standard library.
-* :pep:`624`: Remove ``Py_UNICODE`` encoder APIs.
-* :pep:`670`: Convert macros to functions in the Python C API.
+* :pep:`594`:
+  :ref:`Many legacy standard library modules have been deprecated
+  <whatsnew311-pep594>` and will be removed in Python 3.13
+* :pep:`624`:
+  :ref:`Py_UNICODE encoder APIs have been removed <whatsnew311-pep624>`
+* :pep:`670`:
+  :ref:`Macros converted to static inline functions <whatsnew311-pep670>`
 
 
 .. _whatsnew311-features:
@@ -105,8 +110,8 @@ New Features
 
 .. _whatsnew311-pep657:
 
-PEP 657: Enhanced error locations in tracebacks
------------------------------------------------
+PEP 657: Fine-grained error locations in tracebacks
+---------------------------------------------------
 
 When printing tracebacks, the interpreter will now point to the exact expression
 that caused the error, instead of just the line. For example:
@@ -381,7 +386,7 @@ Kumar Srinivasan and Graham Bleaney.)
 
 .. _whatsnew311-pep681:
 
-PEP 681: Data Class Transforms
+PEP 681: Data class transforms
 ------------------------------
 
 :data:`~typing.dataclass_transform` may be used to
@@ -455,6 +460,8 @@ Other Language Changes
   pickles instance attributes implemented as :term:`slots <__slots__>`.
   (Contributed by Serhiy Storchaka in :issue:`26579`.)
 
+.. _whatsnew311-pythonsafepath:
+
 * Added a :option:`-P` command line option
   and a :envvar:`PYTHONSAFEPATH` environment variable,
   which disable the automatic prepending to :data:`sys.path`
@@ -1497,11 +1504,7 @@ Deprecated
   removed in Python 3.13. Use ``locale.setlocale(locale.LC_ALL, "")`` instead.
   (Contributed by Victor Stinner in :gh:`90817`.)
 
-* The :mod:`asynchat`, :mod:`asyncore` and  :mod:`smtpd` modules have been
-  deprecated since at least Python 3.6. Their documentation and deprecation
-  warnings have now been updated to note they will removed in Python 3.12
-  (:pep:`594`).
-  (Contributed by Hugo van Kemenade in :issue:`47022`.)
+.. _whatsnew311-pep594:
 
 * :pep:`594` led to the deprecations of the following modules which are
   slated for removal in Python 3.13:
@@ -1529,6 +1532,11 @@ Deprecated
   (Contributed by Brett Cannon in :issue:`47061` and Victor Stinner in
   :gh:`68966`.)
 
+* The :mod:`asynchat`, :mod:`asyncore` and  :mod:`smtpd` modules have been
+  deprecated since at least Python 3.6. Their documentation and deprecation
+  warnings have now been updated to note they will removed in Python 3.12.
+  (Contributed by Hugo van Kemenade in :issue:`47022`.)
+
 * More strict rules will be applied now applied for numerical group references
   and group names in regular expressions in future Python versions.
   Only sequence of ASCII digits will be now accepted as a numerical reference.
@@ -1916,6 +1924,8 @@ New Features
 Porting to Python 3.11
 ----------------------
 
+.. _whatsnew311-pep670:
+
 * Some macros have been converted to static inline functions to avoid
   `macro pitfalls <https://gcc.gnu.org/onlinedocs/cpp/Macro-Pitfalls.html>`_.
   The change should be mostly transparent to users,
@@ -2292,6 +2302,8 @@ Removed
   API).
   (Contributed by Victor Stinner in :issue:`45412`.)
 
+.. _whatsnew311-pep624:
+
 * Remove the :c:type:`Py_UNICODE` encoder APIs,
   as they have been deprecated since Python 3.3,
   are little used