Fixed 'missing javadoc' checkstyle info, no functionl modifications.

src/main/java/org/apache/commons/graph/elo/GameResult.java

@@ -25,7 +25,14 @@
 public enum GameResult
 {
 
+    /**
+     * WIN
+     */
     WIN,
+
+    /**
+     * DRAW
+     */
     DRAW;
 
 }

src/main/java/org/apache/commons/graph/visit/VisitState.java

@@ -19,11 +19,24 @@
  * under the License.
  */
 
+/**
+ * Represents the states that the visit can assume.
+ */
 public enum VisitState
 {
-
+    /**
+     * ABORT state
+     */
     ABORT,
+
+    /**
+     * CONTINUE state
+     */
     CONTINUE,
+
+    /**
+     * SKIP state
+     */
     SKIP;
 
 }