[issue13810] refer people to Doc/Makefile when not using 'make' to build main documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 47df28c52840 by Ezio Melotti in branch 'default':
#13810: fix Sphinx URL.
http://hg.python.org/devguide/rev/47df28c52840

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nosy: +python-dev

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