Create a primer section for the descriptor howto guide (GH-22906) (GH0-22918)

diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index 9fdbdb1..189d49e 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -301,7 +301,8 @@
       including functions, methods, properties, class methods, static methods,
       and reference to super classes.
 
-      For more information about descriptors' methods, see :ref:`descriptors`.
+      For more information about descriptors' methods, see :ref:`descriptors`
+      or the :ref:`Descriptor How To Guide <descriptorhowto>`.
 
    dictionary
       An associative array, where arbitrary keys are mapped to values.  The