bug#24520: 25.1.50; calccard.tex has somewhat unclear licensing

[Eli Zaretskii]

> From: Richard Stallman <rms@gnu.org>
> CC: rgm@gnu.org, naesten@gmail.com, 24520@debbugs.gnu.org
> Date: Mon, 14 Nov 2016 19:29:25 -0500
> 
>   > I don't understand why should we treat these files differently from
>   > any other file in the tree.  They all speak about "GNU Emacs".
> 
> The reason it seems good to me to change those words for the refcards
> is that the license exception, and the way the tex output files
> are handled, is quite different from what we permit for GNU Emacs itself.
> 
> I think the situation will be clearer if we don't say these are
> "part of GNU Emacs."

OK, done.