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

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

One problem is that the venv can't always be automatically built in all environments, as a recent Python 3 needs to be available in the right location.

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