[docs] [issue18697] Unify arguments names in Unicode object C API documentation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> @Serhiy will you be proposing a patch for this?

No, I am not. I have no opinion what name is better.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18697>
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