bug#41890: 28.0.50; [PATCH]: Add bindings for project.el

[Eli Zaretskii]

> From: "Basil L. Contovounesios" <contovob@tcd.ie>
> Date: Mon, 20 Jul 2020 13:21:22 +0300
> Cc: "Philip K." <philip@warpmail.net>, 41890@debbugs.gnu.org,
>  42210@debbugs.gnu.org, Dmitry Gutov <dgutov@yandex.ru>, juri@linkov.net
> 
> Sean Whitton <spwhitton@spwhitton.name> writes:
> 
> > +(defcustom project-switch-use-entire-map t
> > +  "Make `project-switch-project' use entire `project-prefix-map'.
> > +If nil, `project-switch-project' will only recognize commands
> > +listed in `project-switch-commands', and signal an error when
> > +others are invoked.  Otherwise, all keys in
> > +`project-switch-commands', are legal even if they aren't listed
>                            ^^^
>                            superfluous comma

Also, GNU standards frown on using "legal" when you actually mean
"valid".  "Legal" and "illegal" should be reserved to describing
issues pertaining to laws and breaking the laws.