turn-on-eldoc-mode docstring clarity

[Kevin Ryde]

Starting from emacs -Q,

    M-x customize-variable emacs-lisp-mode-hook

shows

    [ ] turn-on-eldoc-mode
        Unequivocally turn on eldoc-mode (see variable documentation). [More]

and asking for "More" only adds "(fn)".

It'd be nice if that description had quotes so `eldoc-mode' was a
link, and I think it's the eldoc-mode function which describes the
mode, rather than the variable, if that's what "see variable
documentation" is meant to be referring to (I couldn't tell).  A
sentence saying broadly what the mode does could be helpful under
"More", even if you normally follow to eldoc-mode for the details.


In GNU Emacs 22.1.50.3 (i586-pc-linux-gnu, GTK+ Version 2.10.11)
 of 2007-05-04 on blah
configured using `configure  'CFLAGS=-O' '--prefix=/down/emacs/b/inst' 
'--with-x-toolkit=gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_AU
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t

Major mode: Custom

Minor modes in effect:
  encoded-kbd-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
ESC x c u s t o m i z e - v a r TAB RET e m a c s - 
l i s p - m o d e - h o o k RET ESC x r e p o r t - 
e m a TAB RET

Recent messages:
Loading easymenu...done
Loading cus-edit...done
Loading help-fns...done
Creating customization items...
Creating customization items ...done
Resetting customization items...done
Creating customization setup...done
Loading emacsbug...
Loading regexp-opt...done
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