14.2 Release HW Notes: cleanup keyboard/pointing

For the Release HW Note template and 14.2:
Move keyboards and pointing devices to the top of the Misc section.
Remove inaccurate architecture limitation labels. Fill them in a bit,
and note that human input devices are in Misc in the USB section,
and clean those up a little.

Looking at past HW release notes, these architecture limitation labels
appear to come from 7.0R when all the different hardware architecture
release notes were merged. Back then, this section said:
[amd64, i386, ia64, pc98]. I assume ia64 and pc98 were dropped as they
were dropped, and that is why amd64 and i386 remained.

This commit removes FAX-Modem/PCCARD (requested by emaste).

Reported by: cperciva, emaste, mhorne, wulf
Reported by: Ronald Klop <ronald-lists@klop.ws>
Accepted by: mhorne (mentor)
Differential Revision: https://reviews.freebsd.org/D47699