[docs] [issue30487] DOC: automatically create a venv and install Sphinx when running make

[Caleb Hattingh]

Caleb Hattingh <caleb.hattingh at gmail.com> added the comment:

I messed up the PR through a failed rebase (trying to rebase my PR on top of upstream). I closed the PR as a result.  I have now fixed up my feature branch, but I have not resubmitted the PR.  Since the PR was left alone for many months, I'm ok with leaving things as is, and close this issue?

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<https://bugs.python.org/issue30487>
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