[docs] [issue12160] codecs doc: what is StreamCodec?

[Roundup Robot]

Roundup Robot added the comment:

New changeset 296a09614f31 by Berker Peksag in branch '2.7':
Issue #12160: Fix incorrect StreamCodec references in Codec.encode() and Codec.decode() docs.
https://hg.python.org/cpython/rev/296a09614f31

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<http://bugs.python.org/issue12160>
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