Write missing @return tag description

Change-Id: I8932667e4d99320fbe41438b675c910c1c50d82b
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/OpticalConnectivityIntentCompiler.java b/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/OpticalConnectivityIntentCompiler.java
index 02bc82c..c60325a 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/OpticalConnectivityIntentCompiler.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/OpticalConnectivityIntentCompiler.java
@@ -172,7 +172,7 @@
      *
      * @param path the path
      * @param linkAllocs the link allocations
-     * @return
+     * @return lambda allocated to the given path
      */
     private LambdaResourceAllocation getWavelength(Path path, LinkResourceAllocations linkAllocs) {
         for (Link link : path.links()) {