MFC r267667:
use .Mt to mark up email addresses consistently (part1)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

MFC r287396:

It's 2015, and some people are still trying to use fdisk and then
go asking what debug flags to set for GEOM to make it work. Advice
them to use gpart(8) instead.

Something similar should probably done with disklabel,
but I need to rewrite the disklabel examples first.

Sponsored by: The FreeBSD Foundation

MFC r281320:
Update documented OEM string in newfs_msdos(8).

This was updated in r203868 to better match the naming scheme
in other OSs that use FAT.

MFC r281320:
Update documented OEM string in newfs_msdos(8).

This was updated in r203868 to better match the naming scheme
in other OSs that use FAT.