bug#46331: provided-mode-derived-p doesn't work on aliases

[Reuben Thomas]

On Sat, 6 Feb 2021 at 11:39, Lars Ingebrigtsen <larsi@gnus.org> wrote:

I think adding "MODES or their aliases" was a bit superfluous -- I think
it should be self-evident that that's what's meant here.  I didn't
remove that bit from the doc string, but I think adding it to
derived-mode-p isn't all that helpful.

I agree, but I think it should be consistent between the two functions, otherwise it looks as though they work differently. (If one is reading only the docstrings, not looking at the code.)

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