Make this example correct JSON

Proxy-configuration.md

@@ -26,7 +26,7 @@ add a file called `proxies.json` to your data-directory that looks like
   },
   "usa-1": {
     "label": "BrightData USA",
-    "url": "http://lum-customer-uuuuuuuu-zone-data_center-country-us:ppppppp@zproxy.lum-superproxy.io:22225/",
+    "url": "http://lum-customer-uuuuuuuu-zone-data_center-country-us:ppppppp@zproxy.lum-superproxy.io:22225/"
   },
   "usa-2": {
     "label": "BrightData USA (5 minute recheck limit)",