bug#66282: 26.3; Doc string of `overlay-arrow-string'

[Eli Zaretskii]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Sat, 30 Sep 2023 14:40:26 -0700
> 
> Drew Adams <drew.adams@oracle.com> writes:
> 
> > "String to display as an arrow in non-window frames."
> >
> > What's a non-window frame?
> 
> Should it say "text terminals" perhaps?

I fixed it to say "text-mode frames" instead.  ("Terminal" is slightly
more confusing in this case, and "text-mode frames" says exactly what
we should say.)

> We also have (info "(emacs) Non-Window Terminals"), which seems to be
> speaking of "text terminals".  Should that node be renamed to "text
> terminals" for consistency?

Yes, probably.