[issue17653] fix typo in socketserver.rst

[Roundup Robot]

New submission from Roundup Robot:

New changeset 26639365e62b by Ezio Melotti in branch '3.3':
#17653: fix typo in socketserver docs.  Patch by Tshepang Lekhonkhobe.
http://hg.python.org/cpython/rev/26639365e62b

New changeset 5118304a4c9c by Ezio Melotti in branch 'default':
#17653: merge with 3.3.
http://hg.python.org/cpython/rev/5118304a4c9c

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nosy: +python-dev

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<http://bugs.python.org/issue17653>
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