Add a description for terrain modes

src/main/java/com/volmit/iris/engine/object/IrisTerrainMode.java

@@ -18,6 +18,9 @@
 
 package com.volmit.iris.engine.object;
 
+import com.volmit.iris.engine.object.annotations.Desc;
+
+@Desc("The terrain mode used to tell iris how to generate land")
 public enum IrisTerrainMode {
     NORMAL,
     ISLANDS