ONOS-3200 unify code formation and fix grammar problem

Change-Id: Ieacdfc042e1055713f4502416542055cee8fa97b
diff --git a/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java
index 263027f..226a26e 100644
--- a/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java
+++ b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java
@@ -21,7 +21,7 @@
 import org.onlab.packet.MacAddress;
 
 /**
- * Represents for a entity that carry important information for listener.
+ * Represents for an entity that carry important information for listener.
  */
 public interface OvsdbEventSubject extends EventSubject {
     /**