[docs] [issue15250] document that filecmp.dircmp comparisons are "shallow"

[Chris Jerdonek]

Chris Jerdonek <chris.jerdonek at gmail.com> added the comment:

Thanks a lot for committing this for me Senthil.  And thanks also for creating a separate issue for the other changes.  I appreciate it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15250>
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