trivial: fix where cgroup documentation is not correctly referred to

cgroup documentation was moved to Documentation/cgroups/. There are some
places that still refer to Documentation/controllers/,
Documentation/cgroups.txt and Documentation/cpusets.txt. Fix those.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index 2a39aeb..d05737a 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -86,6 +86,8 @@
 	- describes the cache/TLB flushing interfaces Linux uses.
 cdrom/
 	- directory with information on the CD-ROM drivers that Linux has.
+cgroups/
+	- cgroups features, including cpusets and memory controller.
 connector/
 	- docs on the netlink based userspace<->kernel space communication mod.
 console/
@@ -98,8 +100,6 @@
 	- document describing how CPU load statistics are collected.
 cpuidle/
 	- info on CPU_IDLE, CPU idle state management subsystem.
-cpusets.txt
-	- documents the cpusets feature; assign CPUs and Mem to a set of tasks.
 cputopology.txt
 	- documentation on how CPU topology info is exported via sysfs.
 cris/