Enhance the explanation of using filesystem-specific mount options in /etc/fstab.  We do support passing special options on a per filesystem type basis, like `-u UID -g GID' for mount_msdosfs, but the syntax of these options in fstab is non-obvious and a lot of users have asked about it.
Enhance the explanation of using filesystem-specific mount options
in /etc/fstab.  We do support passing special options on a per
filesystem type basis, like `-u UID -g GID' for mount_msdosfs, but
the syntax of these options in fstab is non-obvious and a lot of
users have asked about it.

PR:		docs/128816
Submitted by:	Roland Smith, rsmith at xs4all dot nl
MFC after:	2 days

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