MFC r290259,r290601:

r290259:

Sync makefs(8) content a bit with src/usr.sbin/makefs/makefs.8@1.53

Sections involving unimplemented filesystems (chfs, msdosfs, udf, v7fs) and
options have been omitted.

Obtained from: NetBSD
Sponsored by: EMC / Isilon Storage Division

r290601:

Follow up to r290259 dealing with makefs(8)

• Don't use contractions (don't -> do not)
• Change "throw away" to "discard" when describing the -o keep-bad-images option
• Revert author e-mail split I brought over from NetBSD, effectively reverting the change bapt made in r267668

Submitted by: bjk
Sponsored by: EMC / Isilon Storage Division