bug#16074: 24.3.50; enhancement request: Remove "pop" from command names & doc for `C-(u|x) C-SPC'

[Drew Adams]

> > > A position is NOT popped off the ring.  That's what's
> > > wrong with all of these.  Likewise, the doc in the
> > > manuals.
> > >
> > > The enhancement request is to fix this wrong
> > > terminology wrt BOTH `global-mark-ring' and
> > > `mark-ring'.
> >
> > And `yank' doesn't yank, and `kill' doesn't kill literally.
> 
> And 'window' is not a window, it's a pane; and 'frame' is actually a
> window, etc. etc.

And all of those terms are standard Emacs
terminology, defined clearly and used
consistently.

That's not the case with this outlier use
of "pop", which is not a pop but is exactly
what Emacs calls "cycling" of a ring.

And again, it's about the doc also, not
just the function names.