bug#3314: 23.0.93; Emacs manual, node RegPos

[Drew Adams]

> >   RegPos     -> Register Positions
> >   RegText    -> Register Text
> >   RegRect    -> Register Rectangles
> >   RegConfig  -> Register Configurations
> >   RegNumbers -> Register Numbers
> >   RegFiles   -> Register Files
> 
> I agree 100%. Thanks.

Oops - except it would be better not to let those names suggest that "register"
is used here as an adjective. It's not about a register position; it's about a
positional register.

So perhaps:

Register, Position
Register, Text
Register, Rectangle
Register, Frames/Windows
Register, Number
Register, File

All use the singular except Frames or Windows, which is a (singular)
configuration of frames or windows.

"Configuration" alone is not too helpful.
"Frames/Windows" is only 1 char longer.
"Frames or Windows" is 4 chars longer.