fix(discovery): add missing slash before path

Author: mediumTaj

Scripts/Services/Discovery/v1/Discovery.cs

@@ -4882,7 +4882,7 @@ public bool GetMetricsQueryTokenEvent(SuccessCallback<MetricTokenResponse> succe
                 req.Parameters["count"] = count;
             req.OnResponse = OnGetMetricsQueryTokenEventResponse;
 
-            RESTConnector connector = RESTConnector.GetConnector(Credentials, "v1/metrics/top_query_tokens_with_event_rate");
+            RESTConnector connector = RESTConnector.GetConnector(Credentials, "/v1/metrics/top_query_tokens_with_event_rate");
             if (connector == null)
                 return false;