Improve documentation of several recent changes
* src/xfaces.c (merge_face_ref): Fix a typo in the commentary. (evaluate_face_filter, filter_face_ref): Minor copyedits in the commentary. * doc/lispref/display.texi (Face Remapping): * doc/lispref/text.texi (Special Properties): Document the ':filter' face specs and their effects. Document 'face-filters-always-match'. * doc/emacs/files.texi (Visiting): Document the new possibility to visit large files literally in response to question asked by Emacs. * etc/NEWS: Mention the new possibility to visit large files literally. * lisp/files.el (files--ask-user-about-large-file): Use "literally" instead of "raw", for consistency with find-file-literally. * doc/lispref/frames.texi (Input Focus): Tell explicitly that focus-change events are sometimes supported on TTY frames.
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