[issue36329] use the right python "make -C Doc/ serve"

[Hugo van Kemenade]

Hugo van Kemenade <hugovk+python at gmail.com> added the comment:

I've made PRs for this:

CPython Docs: https://github.com/python/cpython/pull/32354
Devguide: https://github.com/python/devguide/pull/826

Also set this bpo for Python 3.11.

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versions: +Python 3.11 -Python 3.8

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