memcg: add documentation for the memory.numastat API
memcg: add documentation for the memory.numastat API

[5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org: rework text, fit it into 80-cols]
Signed-off-by: Ying Han <ac3103168222bc871c4c4626b935581739d3d72b@google.com>
Reviewed-by: KOSAKI Motohiro <70a1d3ef3e17a2bb0f09a1b2e6c86f607ed1d6d9@jp.fujitsu.com>
Acked-by: Balbir Singh <ac7b77b73f9d2cc0faddd296218dde0558e170e3@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <634f508bd7c47cf0ee4126243675c3e598920fbc@jp.fujitsu.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas