[media] doc-rst: Fix some Sphinx warnings

Fix all remaining media warnings with ReST that are fixable
without changing at the Sphinx code.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index 8387771..3d885d9 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -180,8 +180,10 @@
  *			view. The media_entity_pipeline_start() function
  *			validates all links by calling this operation. Optional.
  *
- * .. note:: Those these callbacks are called with struct media_device.@graph_mutex
- * mutex held.
+ * .. note::
+ *
+ *    Those these callbacks are called with struct media_device.@graph_mutex
+ *    mutex held.
  */
 struct media_entity_operations {
 	int (*link_setup)(struct media_entity *entity,