Coding gudilines for class and methods javadocs fixed.

Change-Id: I0153e6391c9ec9eacaac65c3989834b6bf5c65bf
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
index fa94f80..79ce0b9 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
@@ -60,10 +60,11 @@
 import static org.onosproject.yangutils.utils.YangConstructType.UNION_DATA;
 
 /**
- * Implements listener based call back function corresponding to the "union" rule
+ * Represents listener based call back function corresponding to the "union" rule
  * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
  */
 public final class UnionListener {
+
     /**
      * Creates a new union listener.
      */