gh-102247: Improve documentation of http.HTTPStatus members update

Author: loic-simon

Doc/library/http.rst

@@ -139,7 +139,8 @@ equal to the constant name (i.e. ``http.HTTPStatus.OK`` is also available as
 
 .. versionchanged:: 3.13
    Implemented RFC9110 naming for status constants. Old constant names are preserved for
-   backwards compatibility.
+   backwards compatibility: ``413 REQUEST_ENTITY_TOO_LARGE``, ``414 REQUEST_URI_TOO_LONG``,
+   ``416 REQUESTED_RANGE_NOT_SATISFIABLE`` and ``422 UNPROCESSABLE_ENTITY``.
 
 HTTP status category
 --------------------

Doc/whatsnew/3.13.rst

@@ -904,6 +904,16 @@ glob
   (Contributed by Barney Gale in :gh:`72904`.)
 
 
+http
+----
+
+* :class:`http.HTTPStatus` was updated to use the names from :rfc:`9110`.
+  This RFC includes some HTTP statuses previously only used for WEBDAV
+  and assigns more generic names to them.
+  The old constants are preserved for backwards compatibility.
+  (Contributed by Michiel W. Beijen in :gh:`102247`.)
+
+
 importlib
 ---------