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/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index be3bde5..755def2 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1593,7 +1593,7 @@
 	nosoftlockup	[KNL] Disable the soft-lockup detector.
 
 	noswapaccount	[KNL] Disable accounting of swap in memory resource
-			controller. (See Documentation/controllers/memory.txt)
+			controller. (See Documentation/cgroups/memory.txt)
 
 	nosync		[HW,M68K] Disables sync negotiation for all devices.
 
@@ -1932,7 +1932,7 @@
 
 	relax_domain_level=
 			[KNL, SMP] Set scheduler's default relax_domain_level.
-			See Documentation/cpusets.txt.
+			See Documentation/cgroups/cpusets.txt.
 
 	reserve=	[KNL,BUGS] Force the kernel to ignore some iomem area