ocfs2: update mount option documentation

We forgot to document the atime_quantum mount option in ocfs2.txt. This adds
a proper description of how it works.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

authored by Tiger Yang and committed by Mark Fasheh bcd5625b c271c5c2

+3
+3
Documentation/filesystems/ocfs2.txt
··· 54 54 intr (*) Allow signals to interrupt cluster operations. 55 55 nointr Do not allow signals to interrupt cluster 56 56 operations. 57 + atime_quantum=60(*) OCFS2 will not update atime unless this number 58 + of seconds has passed since the last update. 59 + Set to zero to always update atime.