Add Override annotations where appropriate

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/material/Bed.java

@@ -61,6 +61,7 @@ public class Bed extends MaterialData implements Directional {
      * Set which direction the head of the bed is facing. Note that this will
      * only affect one of the two blocks the bed is made of.
      */
+    @Override
     public void setFacingDirection(BlockFace face) {
         byte data;
 
@@ -94,6 +95,7 @@ public class Bed extends MaterialData implements Directional {
      *
      * @return the direction the head of the bed is facing
      */
+    @Override
     public BlockFace getFacing() {
         byte data = (byte) (getData() & 0x7);