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

[Senthil Kumaran]

Senthil Kumaran <senthil at uthcode.com> added the comment:

If by attribution, if you mean, proper mention of credits/ acks, during the
commit, I shall add it. Also, I agree that "shallow" should be documented.
But there were few more places which were lacking, so I ended up with
expanding docs after reading the code. I can commit in two phases, if it is
desired or commit yours and then make the other  documentation
improvements. Thanks!

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<http://bugs.python.org/issue15250>
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