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

[Hugo van Kemenade]

Change by Hugo van Kemenade <hugovk+python at gmail.com>:


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nosy: +hugovk
nosy_count: 4.0 -> 5.0
pull_requests: +30406
pull_request: https://github.com/python/cpython/pull/32354

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36329>
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