glossary.rst: Fix typo in package definition (GH-98865)

This is a tiny typo fix of package definition in glossary.
According to https://devguide.python.org/documentation/help-documenting/ simple typos don’t require issues of their own, but, instead, a pull request can by submitted directly.

Automerge-Triggered-By: GH:AlexWaygood
(cherry picked from commit fc94d55)

Co-authored-by: ab <[email protected]>

Author: miss-islington

Doc/glossary.rst

@@ -893,7 +893,7 @@ Glossary
 
    package
       A Python :term:`module` which can contain submodules or recursively,
-      subpackages.  Technically, a package is a Python module with an
+      subpackages.  Technically, a package is a Python module with a
       ``__path__`` attribute.
 
       See also :term:`regular package` and :term:`namespace package`.