[docs] [issue43739] Fixing the example code in Doc/extending/extending.rst to declare and initialize the pmodule variable to be of the right type.

Change by Roundup Robot <devnull@psf.upfronthosting.co.za>: ---------- keywords: +patch nosy: +python-dev nosy_count: 2.0 -> 3.0 pull_requests: +23946 stage: -> patch review pull_request: https://github.com/python/cpython/pull/25207 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue43739> _______________________________________