bug#47105: defface docs

[Reza Nikoopour]

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