add link to e2e tests

Author: aojea

keps/sig-network/1880-multiple-service-cidrs/README.md

@@ -606,9 +606,11 @@ Files:
 
 ##### e2e tests
 
-e2e tests will validate that components that depend on Services are able
+e2e tests validate that components that depend on Services are able
 to use the new ServiceCIDR ranges allocated.
 
+https://testgrid.k8s.io/sig-network-kind#sig-network-kind,%20alpha,%20beta&include-filter-by-regex=ServiceCIDRs
+
 ### Graduation Criteria
 
 #### Alpha