fix test

gax-java/gax-grpc/src/test/java/com/google/api/gax/grpc/InstantiatingGrpcChannelProviderTest.java

@@ -620,7 +620,7 @@ private void createAndCloseTransportChannel(InstantiatingGrpcChannelProvider pro
     createAndCloseTransportChannel(provider);
     assertThat(logHandler.getAllMessages())
         .contains(
-            "DirectPath is misconfigured. Please set the attemptDirectPath option along with the attemptDirectPathXds option.");
+            "DirectPath is misconfigured. The DirectPath XDS option was set, but the attemptDirectPath option was not. Please set both the attemptDirectPath and attemptDirectPathXds options.");
     InstantiatingGrpcChannelProvider.LOG.removeHandler(logHandler);
   }