Javadoc fixes

- fix missing Javadoc @param and @throw annotations
- enable checkstyle checks for method javadocs on non-private methods

Change-Id: I9a370419a699bab3225d85f2f641927600b9f11c
diff --git a/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaImpl.java b/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaImpl.java
index 9a7bd47..0738787 100644
--- a/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaImpl.java
+++ b/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaImpl.java
@@ -524,6 +524,7 @@
      *
      * @param ospfLsa       OSPF LSA instance
      * @param ospfInterface OSPF interface instance
+     * @throws Exception on error
      */
     public void addLsa(OspfLsa ospfLsa, OspfInterface ospfInterface) throws Exception {
         //second param is false as lsa from network
@@ -536,6 +537,7 @@
      * @param ospfLsa          OSPF LSA instance
      * @param isSelfOriginated true if the LSA is self originated. Else false
      * @param ospfInterface    OSPF interface instance
+     * @throws Exception on error
      */
     public void addLsa(OspfLsa ospfLsa, boolean isSelfOriginated, OspfInterface ospfInterface)
             throws Exception {
@@ -720,4 +722,4 @@
     public OspfLsdb database() {
         return database;
     }
-}
\ No newline at end of file
+}