Alter comment on range of delta_q and delta_lf

Update the comment that defines the allowed ranges for
delta_q and delta_lf that can be used with segmentation.

Change-Id: Ie56ad6f946704259e03ffd49921a4cfb7e1e2f1f

vpx/vp8cx.h

@@ -204,8 +204,8 @@ typedef struct vpx_roi_map
     unsigned char *roi_map;      /**< specify an id between 0 and 3 for each 16x16 region within a frame */
     unsigned int   rows;         /**< number of rows */
     unsigned int   cols;         /**< number of cols */
-    int     delta_q[4];          /**< quantizer delta [-64, 64] off baseline for regions with id between 0 and 3*/
-    int     delta_lf[4];         /**< loop filter strength delta [-32, 32] for regions with id between 0 and 3 */
+    int     delta_q[4];          /**< quantizer delta [-63, 63] off baseline for regions with id between 0 and 3*/
+    int     delta_lf[4];         /**< loop filter strength delta [-63, 63] for regions with id between 0 and 3 */
     unsigned int   static_threshold[4];/**< threshold for region to be treated as static */
 } vpx_roi_map_t;