[docs] [issue8617] Better document user site-packages in site module doc

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset b3f72b6450f1 by Éric Araujo in branch '2.7':
Improve documentation for PEP 370 support in site module (#8617).
http://hg.python.org/cpython/rev/b3f72b6450f1

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