bug#3934: 23.0.96; Document `minibuffer-history-variable'

"Drew Adams" <[email protected]>
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]> 
In Info node (elisp)Minibuffer History, please document (mention)
`minibuffer-history-variable'.

In GNU Emacs 23.0.96.1 (i386-mingw-nt5.1.2600)
 of 2009-07-09 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'
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