bug#1988: Making the license statement visible in the Emacs Manual

[Jesse W]

Currently, in the displayed HTML of the Emacs Manual, there is nothing 
the specifically says it is released under the GFDL (GNU Free 
Documentation License), and what the Invariant Sections and Cover-Texts 
are.  It's in an HTML comment, but there isn't even a note in the 
rendered text to tell you to look there.  This makes it more likely 
that people will mis-use the text, by presuming it's under the GFDL 
without any Invariant Sections, and in other ways.

I heard that this had been discussed earlier, but I was unable to find 
it in the archives of gnu.emacs.bug, so I'm bringing it up again.

Jesse Weinstein