bug#12555: 24.2; doc fix for completing-read

[Ikumi Keita]

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Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

C-h f completing-read RET shows the following message.

     (snip)

     If INITIAL-INPUT is non-nil, insert it in the minibuffer initially,
     (snip)
     default value DEF instead.  The user can yank the default value into
     the minibuffer easily using M-x next-history-element.

I suppose "M-n" is better for the last part than "M-x
next-history-element".  Here is a working fix.

*** minibuf.c.orig      2012-08-23 14:33:42.000000000 +0900
--- minibuf.c   2012-08-28 22:49:49.000000000 +0900
*************** DEFUN ("completing-read", Fcompleting_re
*** 1687,1693 ****
    functions, which use one-indexing for POSITION.)  This feature is
    deprecated--it is best to pass nil for INITIAL-INPUT and supply the
    default value DEF instead.  The user can yank the default value into
!   the minibuffer easily using \\[next-history-element].
  
  HIST, if non-nil, specifies a history list and optionally the initial
    position in the list.  It can be a symbol, which is the history list
--- 1687,1693 ----
    functions, which use one-indexing for POSITION.)  This feature is
    deprecated--it is best to pass nil for INITIAL-INPUT and supply the
    default value DEF instead.  The user can yank the default value into
!   the minibuffer easily using 
\\<minibuffer-local-map>\\[next-history-element].
  
  HIST, if non-nil, specifies a history list and optionally the initial
    position in the list.  It can be a symbol, which is the history list


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/home/keita/scr/emacs-24.2/etc/DEBUG.


In GNU Emacs 24.2.1 (i386-unknown-freebsd9.0, GTK+ Version 2.24.6)
 of 2012-10-02 on localhost.my.domain
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
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: ja_JP.eucJP
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: japanese-iso-8bit-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-h f c o m p l e <tab> i <tab> g <tab> <backspace> 
<backspace> <backspace> t i n <tab> <return> <M-next> 
<M-next> M-x r e p o r <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
Type C-x 1 to delete the help window, C-M-v to scroll help.

Load-path shadows:
None found.

Features:
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mm-util mail-prsvr mail-utils help-mode easymenu view help-fns time-date
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