More customization-related documentation updates.
* doc/emacs/custom.texi (Specifying File Variables): The mode: keyword doesn't have to be first anymore. Add example of specifying minor modes. (Directory Variables): Simplify example. Mention application to non-file buffers. (Disabling): Use "initialization file" terminology. (Init Examples): Fix hook example. * doc/lispref/variables.texi (Directory Local Variables): Document hack-dir-local-variables-non-file-buffer. * lisp/files.el (hack-dir-local-variables-non-file-buffer): Add doc. (hack-one-local-variable-eval-safep): Allow 0 arg for minor mode functions, along with 1 and -1.
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