[docs] [issue24082] Obsolete note in argument parsing (c-api/arg.rst)

[R. David Murray]

R. David Murray added the comment:

The note is still valid concerning the length.  (Perhaps Victor should have deprected u instead of fixing it.)

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nosy: +haypo, r.david.murray

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24082>
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