bug#15627: 23.4; docstring for `mode-line-format' should link to default

[Samuel Bronson]

The docstring for `mode-line-format' does not link to
`default-mode-line-format', and there's no way to find it from looking
at the help for `mode-line-format' because the source link for
`mode-line-format' is to a C source file, which is probably not even
installed and even if it were contains no information about the default
value.

Basically, this is a suggestion to include "`default-mode-line-format'"
somewhere in the docstring, preferably near the top.


In GNU Emacs 23.4.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2013-06-30 on binet, modified by Debian
Windowing system distributor `Colin Harrison', version 11.0.60900031
configured using `configure  '--build' 'i486-linux-gnu' '--build' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.4/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/i386-linux-gnu' '--with-x=yes' 
'--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' '--without-gconf' 
'build_alias=i486-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector 
--param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall -DDEBIAN -O2' 
'CPPFLAGS=-D_FORTIFY_SOURCE=2''


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