fat: document additional vfat mount options
fat: document additional vfat mount options

While debugging a sync mount regression on vfat I noticed that there were
mount options parsed by the driver that were not documented.

[1dd685eef08048be95744a1b104ca593a93cc914@mail.parknet.co.jp: fix some parts]
Signed-off-by: Bart Trojanowski <2ece23298f06d9fb45772fdb1d38086918c80f44@jukie.net>
Signed-off-by: OGAWA Hirofumi <1dd685eef08048be95744a1b104ca593a93cc914@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs