"This function clears the face cache for all frames. If UNLOAD-P
is non-`nil', that means to unload all unused fonts as well."
The doc simply repeats the function name, without adding anything useful.
It would be useful to add a little about why someone might
want to clear the face cache. I can't write it, because
I don't know the answer.
If nobody knows the answer, that is unfortunate but no disaster.
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