backend-drm: fix typos

Signed-off-by: Maxime Roussin-Bélanger <maxime.roussinbelanger@gmail.com>

libweston/backend-drm/drm-internal.h

@@ -370,7 +370,7 @@ struct drm_output_state {
 
 /**
  * An instance of this class is created each time we believe we have a plane
- * suitable to be used by a view as a direct scan-out. The list is initalized
+ * suitable to be used by a view as a direct scan-out. The list is initialized
  * and populated locally.
  */
 struct drm_plane_zpos {

libweston/backend-drm/state-propose.c

@@ -670,7 +670,7 @@ drm_output_prepare_plane_view(struct drm_output_state *state,
 
 		if (plane->zpos_min >= current_lowest_zpos) {
 			drm_debug(b, "\t\t\t\t[plane] not adding plane %d to "
-				     "candidate list: minium zpos (%"PRIu64") "
+				     "candidate list: minimum zpos (%"PRIu64") "
 				     "plane's above current lowest zpos "
 				     "(%"PRIu64")\n", plane->plane_id,
 				     plane->zpos_min, current_lowest_zpos);