clientv3/doc: update dial-timeout error handling with new gRPC
// Endpoints: []string{"http://254.0.0.1:12345"},
// DialTimeout: 2 * time.Second
// })
+//
+// // etcd clientv3 >= v3.2.10, grpc/grpc-go >= v1.7.3
+// if err == context.DeadlineExceeded {
+// // handle errors
+// }
+//
+// // etcd clientv3 <= v3.2.9, grpc/grpc-go <= v1.2.1
// if err == grpc.ErrClientConnTimeout {
// // handle errors
// }
