bug#3506: 23.0.94; nil shouldn't be quoted in Info manuals

"Drew Adams" <[email protected]>
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]>
Similarly, throughout the manual. Also, the Org manual uses `nil' in at least
some places.

(Personally, I think `nil' and `t' look better than nil and t, but IIUC those
two symbols are not supposed to be quoted.)
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