mm, memcg: fix some typos in memcontrol.c

There are some typos in comment, fix them.

s/responsiblity/responsibility
s/oflline/offline

Signed-off-by: Ethon Paul <ethp@qq.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200411064246.15781-1-ethp@qq.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/memcontrol.c

@@ -3186,7 +3186,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
  * Test whether @memcg has children, dead or alive.  Note that this
  * function doesn't care whether @memcg has use_hierarchy enabled and
  * returns %true if there are child csses according to the cgroup
- * hierarchy.  Testing use_hierarchy is the caller's responsiblity.
+ * hierarchy.  Testing use_hierarchy is the caller's responsibility.
  */
 static inline bool memcg_has_children(struct mem_cgroup *memcg)
 {
@@ -4838,7 +4838,7 @@ static struct cftype mem_cgroup_legacy_files[] = {
  * limited to 16 bit (MEM_CGROUP_ID_MAX), limiting the total number of
  * memory-controlled cgroups to 64k.
  *
- * However, there usually are many references to the oflline CSS after
+ * However, there usually are many references to the offline CSS after
  * the cgroup has been destroyed, such as page cache or reclaimable
  * slab objects, that don't need to hang on to the ID. We want to keep
  * those dead CSS from occupying IDs, or we might quickly exhaust the