Doc fix; more consistently refer to "text terminals"

Doc fix; more consistently refer to "text terminals"

In the Emacs Lisp manual, we refer to "text terminals" and "graphical
terminals" (see Info node `(elisp) Frames').  But in some places,
including the user manual, the alternative terminology "non-window
terminals" is used instead.

In other places, we use the terminology "non-windowing display"
instead of the more canonical "non-graphical display".

This is less clear than it could be.  Let's consolidate our
terminology to prefer the wording from the Emacs Lisp manual; in other
words, prefer "text" and "non-graphical" to "non-window".

* doc/emacs/frames.texi (Non-Window Terminals): Rename node from this...
(Text Terminals): ...to this.  (Bug#66282)
* doc/emacs/display.texi (Standard Faces):
* doc/emacs/emacs.texi (Top):
* doc/emacs/misc.texi (emacsclient Options):
* doc/misc/viper.texi (Rudimentary Changes)
(Packages that Change Keymaps):
* doc/emacs/frames.texi (Frames, Frame Commands, Mouse Avoidance):
Replace instances of "non-window terminals" with "text terminals".
* doc/misc/ediff.texi (Quick Help Customization):
(Window and Frame Configuration):
* lisp/vc/ediff.el (ediff-windows-wordwise)
(ediff-windows-linewise): Prefer saying 'non-graphical display' to
'non-windowing display'.
* lisp/net/tramp.el (tramp-default-method):
* lisp/printing.el (pr-find-command): Capitalize 'Windows' where it
clearly refers to the non-free operating system with that name.