[issue18385] Add devhelp build instructions to the documentation makefile (Python2)

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> Add devhelp build instructions to the documentation makefile

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18385>
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