[docs] [issue22394] Update documentation building to use venv and pip

[Brett Cannon]

Brett Cannon added the comment:

Attached is a patch against Doc/Makefile to add a venv command to create a venv that can be used to build the documentation. Georg, can you give me an LGTM so I can commit this?

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assignee: brett.cannon -> georg.brandl
keywords: +patch
nosy: +georg.brandl
stage: needs patch -> patch review
Added file: http://bugs.python.org/file37307/doc_venv.diff

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