[docs] [issue21920] Fixed missing colon in the docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6094aa25b33c by Berker Peksag in branch '3.4':
Issue #21920: Add a missing colon to the __main__ doc.
http://hg.python.org/cpython/rev/6094aa25b33c

New changeset e22d0ff286f9 by Berker Peksag in branch 'default':
Issue #21920: Merge from 3.4.
http://hg.python.org/cpython/rev/e22d0ff286f9

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nosy: +python-dev

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<http://bugs.python.org/issue21920>
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