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/material/FlowerPot.java

@@ -50,7 +50,8 @@ public class FlowerPot extends MaterialData {
     /**
      * Get the material in the flower pot
      *
-     * @return material MaterialData for the block currently in the flower pot or null if empty
+     * @return material MaterialData for the block currently in the flower pot
+     *     or null if empty
      */
     public MaterialData getContents() {
         switch (getData()) {