[docs] [issue19980] Improve help('non-topic') response

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4a1fe339dcf6 by Serhiy Storchaka in branch 'default':
Issue #19980: Improved help() for non-recognized strings.  help('') now
https://hg.python.org/cpython/rev/4a1fe339dcf6

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nosy: +python-dev

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<http://bugs.python.org/issue19980>
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