[issue24898] Documentation for str.find() is confusing

[Roundup Robot]

Roundup Robot added the comment:

New changeset da934a19855b by Senthil Kumaran in branch '2.7':
Backport documentation improvement.
https://hg.python.org/cpython/rev/da934a19855b

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<http://bugs.python.org/issue24898>
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