Please change http://mpfr.org to https://www.mpfr.org/

[Vincent Lefevre]

Hi,

The GMP manual doc/gmp.texi currently has @url{http://mpfr.org}.
But mpfr.org is poorly handled by Inria (no certificate and the
redirection to https://www.mpfr.org/ does not always work,
possibly to a temporary URL like currently, as one obtains
mpfr.loria.fr). This URL should be changed to

  https://www.mpfr.org/

The http://mpfr.org URL in doc/projects.html should be updated too.

Thanks,

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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