bug#52290: 28.0.90; Undocumented generalized variables

[Lars Ingebrigtsen <larsi@gnus.org>]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I think we should implement the obsoletion mechanism and then just go
> through that list and obsolete all the stuff that doesn't seem useful
> (and isn't used in-tree).  And then document the rest, as well as make
> the *Help* buffer mention that they're generalised variables.

The obsoletion mechanism is now in place in Emacs 29, and I've obsoleted
a whole bunch of nonsensical gv-setters.  (Feel free to obsolete more of
them, everybody.)

I've now made *Help* mention whether a function is a generalised
variable.

I'm not sure there's need to document all the generalised variables in
the manual, though.  The *Help* buffer should be sufficient, and if
they're not obvious (i.e., need documentation), then they should
probably be obsoleted.

But it might be nice to document, say, `if'.