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Ref: http://lists.gnu.org/archive/html/emacs-devel/2012-01/msg00374.html
(Warning: interminable bikeshedding in thread)

* lisp/info.el (Info-enable-edit): Remove.
(Info-edit): Disable it rather than using Info-enable.
(Info-edit-mode-hook, Info-edit-map, Info-edit-mode, Info-edit)
(Info-cease-edit): Make editing of Info files obsolete.

* etc/NEWS: Mention this.