bug#9711: 24.0.50; doc string of defcustom

[Chong Yidong]

"Drew Adams" <drew.adams@oracle.com> writes:

> "The remaining arguments should have the form
>  
>    [KEYWORD VALUE]..."
>  
> After that, the keywords are described, with VALUE presumably being
> different for each one.  That's OK, but we should not be using the same
> name, "VALUE" for the argument in the arglist.

Fixed, thanks.

> In addition, this seems wrong:
>
> "Neither SYMBOL nor VALUE need to be quoted."
>
> Huh?  VALUE is evaluated.  What is meant by this statement?

That argument is evaluated, but it is also used as an expression.  I
edited the docstring to make this clearer.