Document values of window-system and deprecate its use as predicate.
src/frame.c (Fframep, Fwindow_system): Deprecate use as a predicate. Document all values. src/dispnew.c (syms_of_display) <initial-window-system, window-system>: Deprecate use as a boolean flag. Document all values. src/display.texi (Window Systems): Deprecate use of window-system as a predicate.
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