Updates to Display chapter of Lisp manual.
* doc/lispref/display.texi (The Echo Area): Add xref to Output Streams. (Displaying Messages): Improve doc of message. (Echo Area Customization, Invisible Text): Copyedits. (Invisible Text): Mention that spec comparison is done with eq. (Width): Improve doc of char-width. (Faces): Recommend using symbol instead of string for face name. Minor clarifications. (Defining Faces): Copyedits. Update face example. (Attribute Functions): Mark set-face-foreground etc as commands. (Face Remapping): Mention text-scale-adjust. Clarify face-remapping-alist and related docs. (Face Functions): Don't document make-face or copy-face. * lisp/faces.el (make-face, make-empty-face, copy-face): * lisp/face-remap.el (face-remap-add-relative, face-remap-set-base): Doc fixes. * src/xfaces.c (Vface_remapping_alist): Doc fix.
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