remove some dead/squatted links

myx can't reconfigure xfp/sfp/sfp+ modules

use .Mt for email addresses; from Jan Stary <hans at stare dot cz>; ok jmc@

Use .Lk for HTTP hyperlinks, not .Pa.
Most of the patch from Arto Jonsson <ajonsson at kapsi dot fi>.
jmc@ agrees in principle that .Lk is the right macro to use.

While here, update a few broken lin

Use .Lk for HTTP hyperlinks, not .Pa.
Most of the patch from Arto Jonsson <ajonsson at kapsi dot fi>.
jmc@ agrees in principle that .Lk is the right macro to use.

While here, update a few broken links,
and add missing markup at a few places.

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"Gen2" adapters based on Lanai-Z8ES chipset are supported as well

convert to new .Dd format;

import the initial Myrinet Myri-10G myx(4) manpage