Improve the documentation of M-n for entering file names
* lisp/files.el (find-file, find-file-other-window) (find-file-other-frame): Mention file-name-at-point-functions in the doc string. Reported by Florian Weimer <firstname.lastname@example.org> in http://lists.gnu.org/archive/html/emacs-devel/2017-11/msg00224.html. * doc/emacs/mini.texi (Minibuffer History): Document file-name-at-point-functions and its effect on M-n when typing file names in the minibuffer. * doc/emacs/files.texi (File Names): * doc/emacs/mini.texi (Minibuffer File): Add a cross-reference to "Minibuffer History", where special features of M-n regarding files are described.
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