GUI2 fixed some unit tests

and updated documentation

Change-Id: Icb66f91b64172359c9ddadd4bfd2531ed28f5be0
diff --git a/web/gui2-topo-lib/lib/topology.service.spec.ts b/web/gui2-topo-lib/lib/topology.service.spec.ts
index 8e19270..f5a7680 100644
--- a/web/gui2-topo-lib/lib/topology.service.spec.ts
+++ b/web/gui2-topo-lib/lib/topology.service.spec.ts
@@ -72,6 +72,6 @@
     });
 
     it('should be created', inject([TopologyService], (service: TopologyService) => {
-        expect(service).toBeFalsy();
+        expect(service).toBeTruthy();
     }));
 });