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

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +24067
pull_request: https://github.com/python/cpython/pull/25333

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43739>
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