Fix more minor mode docstrings.

* lisp/emulation/cua-base.el (cua-mode):
* lisp/mail/footnote.el (footnote-mode):
* lisp/mail/mailabbrev.el (mail-abbrevs-mode):
* lisp/net/xesam.el (xesam-minor-mode):
* lisp/progmodes/bug-reference.el (bug-reference-mode):
* lisp/progmodes/cap-words.el (capitalized-words-mode):
* lisp/progmodes/compile.el (compilation-minor-mode)
(compilation-shell-minor-mode):
* lisp/progmodes/gud.el (gud-tooltip-mode):
* lisp/progmodes/hideif.el (hide-ifdef-mode):
* lisp/progmodes/idlw-shell.el (idlwave-shell-electric-debug-mode):
* lisp/progmodes/subword.el (subword-mode):
* lisp/progmodes/vhdl-mode.el (vhdl-electric-mode, vhdl-stutter-mode):
* lisp/progmodes/which-func.el (which-function-mode):
* lisp/term/tvi970.el (tvi970-set-keypad-mode):
* lisp/term/vt100.el (vt100-wide-mode):
* lisp/textmodes/flyspell.el (flyspell-mode):
* lisp/textmodes/ispell.el (ispell-minor-mode):
* lisp/textmodes/nroff-mode.el (nroff-electric-mode):
* lisp/textmodes/paragraphs.el (use-hard-newlines):
* lisp/textmodes/refill.el (refill-mode):
* lisp/textmodes/reftex.el (reftex-mode):
* lisp/textmodes/rst.el (rst-minor-mode):
* lisp/textmodes/sgml-mode.el (html-autoview-mode)
(sgml-electric-tag-pair-mode):
* lisp/textmodes/tex-mode.el (latex-electric-env-pair-mode):
* lisp/vc/diff-mode.el (diff-auto-refine-mode, diff-minor-mode):
* lisp/emulation/crisp.el (crisp-mode):
* lisp/emacs-lisp/eldoc.el (eldoc-mode):
* lisp/emacs-lisp/checkdoc.el (checkdoc-minor-mode): Doc fixes for new
minor mode behavior.

* lisp/erc/erc-fill.el (erc-fill-mode):
* lisp/erc/erc-track.el (erc-track-minor-mode): Doc fix.

* lisp/erc/erc.el (define-erc-module): Fix autogenerated docstring to
reflect Emacs 24 minor mode changes.

* lisp/gnus/gnus-cite.el (gnus-message-citation-mode): Doc fix (in Emacs 24,
calling a minor mode from Lisp with nil arg enables it, so we have to
make the working a bit ambiguous here).

lisp/emacs-lisp/checkdoc.el

@@ -1237,9 +1237,10 @@ generating a buffered list of errors."
 
 ;;;###autoload
 (define-minor-mode checkdoc-minor-mode
-  "Toggle Checkdoc minor mode, a mode for checking Lisp doc strings.
-With prefix ARG, turn Checkdoc minor mode on if ARG is positive, otherwise
-turn it off.
+  "Toggle automatic docstring checking (Checkdoc minor mode).
+With a prefix argument ARG, enable Checkdoc minor mode if ARG is
+positive, and disable it otherwise.  If called from Lisp, enable
+the mode if ARG is omitted or nil.
 
 In Checkdoc minor mode, the usual bindings for `eval-defun' which is
 bound to \\<checkdoc-minor-mode-map>\\[checkdoc-eval-defun] and `checkdoc-eval-current-buffer' are overridden to include

lisp/emacs-lisp/eldoc.el

@@ -149,14 +149,17 @@ This is used to determine if `eldoc-idle-delay' is changed by the user.")
 
 ;;;###autoload
 (define-minor-mode eldoc-mode
-  "Toggle ElDoc mode on or off.
-In ElDoc mode, the echo area displays information about a
-function or variable in the text where point is.  If point is
-on a documented variable, it displays the first line of that
-variable's doc string.  Otherwise it displays the argument list
-of the function called in the expression point is on.
+  "Toggle echo area display of Lisp objects at point (ElDoc mode).
+With a prefix argument ARG, enable ElDoc mode if ARG is positive,
+and disable it otherwise.  If called from Lisp, enable ElDoc mode
+if ARG is omitted or nil.
 
-With prefix ARG, turn ElDoc mode on if and only if ARG is positive."
+ElDoc mode is a buffer-local minor mode.  When enabled, the echo
+area displays information about a function or variable in the
+text where point is.  If point is on a documented variable, it
+displays the first line of that variable's doc string.  Otherwise
+it displays the argument list of the function called in the
+expression point is on."
   :group 'eldoc :lighter eldoc-minor-mode-string
   (setq eldoc-last-message nil)
   (if eldoc-mode