Fix Javadoc warnings

Change-Id: Icf8b6b6f77ea80d3975aa975226a178145067adf
diff --git a/core/api/src/main/java/org/onosproject/net/config/NetworkConfigService.java b/core/api/src/main/java/org/onosproject/net/config/NetworkConfigService.java
index d1d280f..26c11b8 100644
--- a/core/api/src/main/java/org/onosproject/net/config/NetworkConfigService.java
+++ b/core/api/src/main/java/org/onosproject/net/config/NetworkConfigService.java
@@ -182,6 +182,7 @@
      * Clears the  configuration including queued based on the subject.
      * If does not exists this call has no effect.
      *
+     * @param <S>               type of subject
      * @param subject           configuration subject
      */
     <S> void removeConfig(S subject);
@@ -190,6 +191,7 @@
      * Clears the complete configuration including queued.
      * If does not exists this call has no effect.
      *
+     * @param <S>               type of subject
      */
     <S> void removeConfig();
 }