[docs] documentation bug in "C/API Unicode Objects and Codecs"

[tomo cocoa]

Hello

I am a Japanese Pythonista and a Python documentation translator.

I found a bug in the documentation of UTF-16 Codecs.
http://docs.python.org/c-api/unicode.html#utf-16-codecs

The passages about the function PyUnicode_DecodeUTF16 starts with
"Decode length bytes from".
But I think s/length/size/, because there is no formal parameter named
"length" but "size".

Regards


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