[docs] [issue11979] Minor improvements to the Sockets readme: typos, wording and sphinx features usage

[Xavier Morel]

Changes by Xavier Morel <xavier.morel at masklinn.net>:


Added file: http://bugs.python.org/file21854/sphinx-features

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11979>
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