Fix a typo in Documentation/cgroups/freezer-subsystem.txt.
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: NRandy Dunlap <rdunlap@xenotime.net>