javadoc fixed for bgp

Change-Id: I4ac3d00771a6076ac55b808b55497b55d66e656f
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrProtectionType.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrProtectionType.java
index 8882936..dc023b5 100644
--- a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrProtectionType.java
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrProtectionType.java
@@ -107,6 +107,7 @@
      * Returns Link Protection Type.
      *
      * @return Link Protection Type
+     * @throws BgpParseException when failed to parse link protection type
      */
     public ProtectionType protectionType() throws BgpParseException {
         switch (linkProtectionType) {