Fix minor mode docstrings for the new meaning of a nil ARG.

* abbrev.el (abbrev-mode):
* allout.el (allout-mode):
* autoinsert.el (auto-insert-mode):
* autoarg.el (autoarg-mode, autoarg-kp-mode):
* autorevert.el (auto-revert-mode, auto-revert-tail-mode)
(global-auto-revert-mode):
* battery.el (display-battery-mode):
* composite.el (global-auto-composition-mode)
(auto-composition-mode):
* delsel.el (delete-selection-mode):
* desktop.el (desktop-save-mode):
* dired-x.el (dired-omit-mode):
* dirtrack.el (dirtrack-mode):
* doc-view.el (doc-view-minor-mode):
* double.el (double-mode):
* electric.el (electric-indent-mode, electric-pair-mode):
* emacs-lock.el (emacs-lock-mode):
* epa-hook.el (auto-encryption-mode):
* follow.el (follow-mode):
* font-core.el (font-lock-mode):
* frame.el (auto-raise-mode, auto-lower-mode, blink-cursor-mode):
* help.el (temp-buffer-resize-mode):
* hilit-chg.el (highlight-changes-mode)
(highlight-changes-visible-mode):
* hi-lock.el (hi-lock-mode):
* hl-line.el (hl-line-mode, global-hl-line-mode):
* icomplete.el (icomplete-mode):
* ido.el (ido-everywhere):
* image-file.el (auto-image-file-mode):
* image-mode.el (image-minor-mode):
* iswitchb.el (iswitchb-mode):
* jka-cmpr-hook.el (auto-compression-mode):
* linum.el (linum-mode):
* longlines.el (longlines-mode):
* master.el (master-mode):
* mb-depth.el (minibuffer-depth-indicate-mode):
* menu-bar.el (menu-bar-mode):
* minibuf-eldef.el (minibuffer-electric-default-mode):
* mouse-sel.el (mouse-sel-mode):
* msb.el (msb-mode):
* mwheel.el (mouse-wheel-mode):
* outline.el (outline-minor-mode):
* paren.el (show-paren-mode):
* recentf.el (recentf-mode):
* reveal.el (reveal-mode, global-reveal-mode):
* rfn-eshadow.el (file-name-shadow-mode):
* ruler-mode.el (ruler-mode):
* savehist.el (savehist-mode):
* scroll-all.el (scroll-all-mode):
* scroll-bar.el (scroll-bar-mode):
* server.el (server-mode):
* shell.el (shell-dirtrack-mode):
* simple.el (auto-fill-mode, transient-mark-mode)
(visual-line-mode, overwrite-mode, binary-overwrite-mode)
(line-number-mode, column-number-mode, size-indication-mode)
(auto-save-mode, normal-erase-is-backspace-mode, visible-mode):
* strokes.el (strokes-mode):
* time.el (display-time-mode):
* t-mouse.el (gpm-mouse-mode):
* tool-bar.el (tool-bar-mode):
* tooltip.el (tooltip-mode):
* type-break.el (type-break-mode-line-message-mode)
(type-break-query-mode):
* view.el (view-mode):
* whitespace.el (whitespace-mode, whitespace-newline-mode)
(global-whitespace-mode, global-whitespace-newline-mode):
* xt-mouse.el (xterm-mouse-mode): Doc fix.

* emacs-lisp/easy-mmode.el (define-globalized-minor-mode): Fix
autogenerated docstring.

lisp/hl-line.el

@@ -124,10 +124,13 @@ This variable is expected to be made buffer-local by modes.")
 
 ;;;###autoload
 (define-minor-mode hl-line-mode
-  "Buffer-local minor mode to highlight the line about point.
-With ARG, turn Hl-Line mode on if ARG is positive, off otherwise.
+  "Toggle highlighting of the current line (Hl-Line mode).
+With a prefix argument ARG, enable Hl-Line mode if ARG is
+positive, and disable it otherwise.  If called from Lisp, enable
+the mode if ARG is omitted or nil.
 
-If `hl-line-sticky-flag' is non-nil, Hl-Line mode highlights the
+Hl-Line mode is a buffer-local minor mode.  If
+`hl-line-sticky-flag' is non-nil, Hl-Line mode highlights the
 line about the buffer's point in all windows.  Caveat: the
 buffer's point might be different from the point of a
 non-selected window.  Hl-Line mode uses the function
@@ -171,8 +174,10 @@ addition to `hl-line-highlight' on `post-command-hook'."
 
 ;;;###autoload
 (define-minor-mode global-hl-line-mode
-  "Global minor mode to highlight the line about point in the current window.
-With ARG, turn Global-Hl-Line mode on if ARG is positive, off otherwise.
+  "Toggle line highlighting in all buffers (Global Hl-Line mode).
+With a prefix argument ARG, enable Global Hl-Line mode if ARG is
+positive, and disable it otherwise.  If called from Lisp, enable
+the mode if ARG is omitted or nil.
 
 If `global-hl-line-sticky-flag' is non-nil, Global Hl-Line mode
 highlights the line about the current buffer's point in all