Generic cleanup of warnings, whitespace and style.

By: Erik Broes <erikbroes@grum.nl>

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

@@ -6,6 +6,7 @@ public interface Directional {
 
     /**
      * Sets the direction that this block is facing in
+     *
      * @param face The facing direction
      */
     public void setFacingDirection(BlockFace face);