Documentation/cgroups/memory.txt: fix stat file documentation

Documentation for inactive_anon / active_anon was mixed up. Fix that.
Signed-off-by: NAaro Koskinen <aaro.koskinen@nsn.com>
Acked-by: NRob Landley <rob@landley.net>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation/cgroups/memory.txt

@@ -490,10 +490,10 @@ pgpgin		- # of charging events to the memory cgroup. The charging
 pgpgout		- # of uncharging events to the memory cgroup. The uncharging
 		event happens each time a page is unaccounted from the cgroup.
 swap		- # of bytes of swap usage
-inactive_anon	- # of bytes of anonymous memory and swap cache memory on
+inactive_anon	- # of bytes of anonymous and swap cache memory on inactive
 		LRU list.
 active_anon	- # of bytes of anonymous and swap cache memory on active
-		inactive LRU list.
+		LRU list.
 inactive_file	- # of bytes of file-backed memory on inactive LRU list.
 active_file	- # of bytes of file-backed memory on active LRU list.
 unevictable	- # of bytes of memory that cannot be reclaimed (mlocked etc).