cgroups: Documentation: fix wrong cgroupfs paths

Few paths used as example to describe cgroupfs usage have been wrong
from f6e07d38 ("Documentation: update cgroupfs mount point") by
mistake. This patch fix those trivial wrong paths.
Signed-off-by: NSeongJae Park <sj38.park@gmail.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/cgroups/cgroups.txt

@@ -312,10 +312,10 @@ the "cpuset" cgroup subsystem, the steps are something like:
  2) mkdir /sys/fs/cgroup/cpuset
  3) mount -t cgroup -ocpuset cpuset /sys/fs/cgroup/cpuset
  4) Create the new cgroup by doing mkdir's and write's (or echo's) in
-    the /sys/fs/cgroup virtual file system.
+    the /sys/fs/cgroup/cpuset virtual file system.
  5) Start a task that will be the "founding father" of the new job.
  6) Attach that task to the new cgroup by writing its PID to the
-    /sys/fs/cgroup/cpuset/tasks file for that cgroup.
+    /sys/fs/cgroup/cpuset tasks file for that cgroup.
  7) fork, exec or clone the job tasks from this founding father task.
 
 For example, the following sequence of commands will setup a cgroup