slub: correct comments error for per cpu partial

Correct comment errors, that mistake cpu partial objects number as pages
number, may make reader misunderstand.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/mm/slub.c b/mm/slub.c
index 4982fb5..8f68757 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3084,7 +3084,7 @@
 	 *
 	 * A) The number of objects from per cpu partial slabs dumped to the
 	 *    per node list when we reach the limit.
-	 * B) The number of objects in partial partial slabs to extract from the
+	 * B) The number of objects in cpu partial slabs to extract from the
 	 *    per node list when we run out of per cpu objects. We only fetch 50%
 	 *    to keep some capacity around for frees.
 	 */