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

[Petr Viktorin]

Petr Viktorin added the comment:

The note is *correct* concerning the length, but I don't think it's relevant: in a NUL-terminated string without embedded NULs, the length is unambiguous.

The other issues are about "u" itself, not the note. (I have nothing against the "it is recommended to use u# or U instead" part, but the reasons the note gives are wrong and irrelevant, respectively.)

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<http://bugs.python.org/issue24082>
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