xfs_quota: fix up timer command help

xfs_quota: fix up timer command help

The timer command help output suggests that either default, or a
specific ID, can be specified, but this is not the case.  Timers
are fs-wide for each quota type, not specific to the user.  So
remove the "-d|id|name" from the help output.  Also remove
"get" from the description, because it only sets these timers;
"state" returns their values.  Well actually just one of them,
but that's a different problem...

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>