[docs] [issue16236] Doc/Makefile should have $PYTHON=python2

[Ned Deily]

Ned Deily added the comment:

The patch should not unconditionally use `python2` since many distributions do not yet install a `python2` link to the interpreter nor is there one when running python2.7 from a build directory.  The Makefile could conditionally try `python2` and then fall back to `python`.

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nosy: +ned.deily
versions: +Python 2.7 -Python 3.1, Python 3.5

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