pythongh-103721: Improve cross-references for generic-alias docs (python#103838)

AlexWaygood · web-flow · commit cef542ca572f · 2023-04-25T10:24:49.000-06:00
Cc. @adriangb The "stub documentation" in `types.rst` does already link to the in-depth docs in `stdtypes.rst`, but the link isn't obvious for new users. It deserves to be made more prominent. - Issue: python#103721
diff --git a/Doc/library/types.rst b/Doc/library/types.rst
@@ -351,6 +351,13 @@ Standard names are defined for the following types:
    .. versionchanged:: 3.9.2
       This type can now be subclassed.
 
+   .. seealso::
+
+      :ref:`Generic Alias Types<types-genericalias>`
+         In-depth documentation on instances of :class:`!types.GenericAlias`
+
+      :pep:`585` - Type Hinting Generics In Standard Collections
+         Introducing the :class:`!types.GenericAlias` class
 
 .. class:: UnionType
 
