[docs] [issue16323] Wrong C API documentation for locale encoding

[STINNER Victor]

STINNER Victor added the comment:

"Encode a Unicode object to the current locale encoding. The encoder is strict if *errors* is equal to ``strict``, otherwise it uses the ``'surrogateescape'`` error handler (:pep:`383`)."

Hum, this is not correct. There are three valid values:
 - NULL: strict
 - "strict": strict
 - "surrogateescape": use PEP 383

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<http://bugs.python.org/issue16323>
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