Fix code example variable name

packages/website/docs/getting_started/quick_start.md

@@ -26,7 +26,7 @@ export function networkRequestor(uri, requestVerb, headers, body) {
     const endpoint = 'https://services.odata.org/v4/TripPinServiceRW';
     const requestUrl = `${endpoint}${uri}`;
 
-    return fetch(url, {
+    return fetch(requestUrl, {
         method: requestVerb,
         headers,
         body: JSON.stringify(body),