Pulling all pending Bukkit-JavaDoc changes

A special thanks goes to @aerouk for almost all of the changes found here.

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/Rotation.java

@@ -2,6 +2,7 @@ package org.bukkit;
 
 /**
  * An enum to specify a rotation based orientation, like that on a clock.
+ * <p>
  * It represents how something is viewed, as opposed to cardinal directions.
  */
 public enum Rotation {