[doc] bpo-45680: Improve glossary entry for generic types (GH-29388)

Co-authored-by: Łukasz Langa <[email protected]>

Author: AlexWaygood

Doc/glossary.rst

@@ -510,12 +510,13 @@ Glossary
       :func:`functools.singledispatch` decorator, and :pep:`443`.
 
    generic type
-      A :term:`type` that can be parameterized; typically a container like
-      :class:`list`. Used for :term:`type hints <type hint>` and
+      A :term:`type` that can be parameterized; typically a
+      :ref:`container class<sequence-types>` such as :class:`list` or
+      :class:`dict`. Used for :term:`type hints <type hint>` and
       :term:`annotations <annotation>`.
 
-      See :pep:`483` for more details, and :mod:`typing` or
-      :ref:`generic alias type <types-genericalias>` for its uses.
+      For more details, see :ref:`generic alias types<types-genericalias>`,
+      :pep:`483`, :pep:`484`, :pep:`585`, and the :mod:`typing` module.
 
    GIL
       See :term:`global interpreter lock`.