[3.13] pythongh-89554: Document typing.ParamSpecArgs and ParamSpecKwargs as classes (pythonGH-150677) (pythonGH-150765)

Use the directive "class" instead of "data" for ParamSpecArgs and ParamSpecKwargs.
(cherry picked from commit 35c314d)

Co-authored-by: Bernát Gábor <gaborjbernat@gmail.com>

Author: miss-islington

Doc/library/typing.rst

@@ -2163,8 +2163,8 @@ without the dedicated syntax, as documented below.
       * :data:`Concatenate`
       * :ref:`annotating-callables`
 
-.. data:: ParamSpecArgs
-          ParamSpecKwargs
+.. class:: ParamSpecArgs
+           ParamSpecKwargs
 
    Arguments and keyword arguments attributes of a :class:`ParamSpec`. The
    ``P.args`` attribute of a ``ParamSpec`` is an instance of ``ParamSpecArgs``,