[Bug manual/33740] wcwidth is not described in the manual

[vincent-srcware at vinc17 dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=33740

--- Comment #1 from Vincent Lefèvre <vincent-srcware at vinc17 dot net> ---
The description would need to take into account printable characters for which
the width is not determinable as this depends on the context, such as U+FE0F
VARIATION SELECTOR-16 (VS16), but the behavior would also need to be corrected;
see bug 33741.

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