* doc/lispref/objects.texi (Ctl-Char Syntax): Fix incorrect remark;
some text terminals can generate ASCII control characters.
(Other Char Bits):
* lisp/bindings.el:
* lisp/gnus/gnus-undo.el (gnus-undo-mode-map): Say "graphical display"
and "GUI display" instead of "X terminal"; the latter term is
archaic. (Bug#51217)