[docs] [issue15288] Clarify the pkgutil.walk_packages() note

[Roundup Robot]

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

New changeset 96f7926ea444 by Brett Cannon in branch 'default':
Issue #15288: Clarify that pkgutil.walk_packages() and friends will no
http://hg.python.org/cpython/rev/96f7926ea444

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nosy: +python-dev

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