[3.11] gh-115405: add versionadded tag for co_qualname in code objects documentation (GH-115411) (#115413)

gh-115405: add versionadded tag for co_qualname in code objects documentation (GH-115411)
(cherry picked from commit de07941)

Co-authored-by: Christophe Papazian <114495376+christophe-papazian@users.noreply.github.com>

Author: miss-islington

Doc/reference/datamodel.rst

@@ -1121,6 +1121,8 @@ Special read-only attributes
    * - .. attribute:: codeobject.co_qualname
      - The fully qualified function name
 
+       .. versionadded:: 3.11
+
    * - .. attribute:: codeobject.co_argcount
      - The total number of positional :term:`parameters <parameter>`
        (including positional-only parameters and parameters with default values)