[issue16813] use paths relative to CPython root in documentation building instructions

[Roundup Robot]

Roundup Robot added the comment:

New changeset 20333d160f4e by Chris Jerdonek in branch 'default':
Issue #16813: Use the full relative path in the documentation-building instructions.
http://hg.python.org/devguide/rev/20333d160f4e

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nosy: +python-dev

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