mtd: Better comment NAND_BBT_NO_OOB

Amend the comment to reflect the fact NAND_BBT_NO_OOB refers to the
location of the bad block table marker.
Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

include/linux/mtd/bbm.h

@@ -108,7 +108,10 @@ struct nand_bbt_descr {
  * OOB area. This option is passed to the default bad block table function.
  */
 #define NAND_BBT_USE_FLASH	0x00020000
-/* Do not store flash based bad block table in OOB area; store it in-band */
+/*
+ * Do not store flash based bad block table marker in the OOB area; store it
+ * in-band.
+ */
 #define NAND_BBT_NO_OOB		0x00040000
 /*
  * Do not write new bad block markers to OOB; useful, e.g., when ECC covers