bug#47105: defface docs

[Reza Nikoopour <rnikoopour@gmail.com>]

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Hello,

I've been reading the docs in the emacs manual about defface:

https://www.gnu.org/software/emacs/manual/html_node/elisp/Defining-Faces.html

I had a question about the following two conventions

People are sometimes tempted to create a variable whose value is a face
> name. In the vast majority of cases, this is not necessary; the usual
> procedure is to define a face with defface, and then use its name directly.


You should not quote the symbol face, and it should not end in ‘-face’
> (that would be redundant).


I see both of these conventions in font-lock.el.

https://github.com/emacs-mirror/emacs/blob/master/lisp/font-lock.el#L318-L319
https://github.com/emacs-mirror/emacs/blob/master/lisp/font-lock.el#L1976-L1979

Could the docs be updated to reflect what's happening in font-lock.el?  I'd
be happy to make the contribution, but I don't know the proper way to
suggest an update to the manual.

Alternatively, could it be explained why font-lock.el doesn't follow these
conventions?

Cheers,
Reza

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