memblock: fix missing comment of memblock_insert_region()

There is no comment for parameter nid of memblock_insert_region().
This patch adds comment for it.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memblock.c b/mm/memblock.c
index 2cce8b3..c5fad93 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -322,10 +322,11 @@
 
 /**
  * memblock_insert_region - insert new memblock region
- * @type: memblock type to insert into
- * @idx: index for the insertion point
- * @base: base address of the new region
- * @size: size of the new region
+ * @type:	memblock type to insert into
+ * @idx:	index for the insertion point
+ * @base:	base address of the new region
+ * @size:	size of the new region
+ * @nid:	node id of the new region
  *
  * Insert new memblock region [@base,@base+@size) into @type at @idx.
  * @type must already have extra room to accomodate the new region.