Deletion of Fmask

Comment: per MER-C. It's . Unambiguous violation of this policy
Stance: delete
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTMANUAL)

Comment: to fstab per  and OTMANUAL. This is an individual option for the mount (computing)|mount command and a configuration directive for fstab. (umask is definitely the wrong target, my bad.) 100% of the content belongs in an instruction manual, so a merge isn't really needed, just fixing the applicable sentence at Fstab#fat
Stance: merge
Cited policy: Wikipedia:Notability (WP:N||WP:NOTMANUAL)