update endpoint

Author: xingsy97

specification/webpubsub/data-plane/WebPubSub/stable/2023-07-01/webpubsub.json

@@ -1794,7 +1794,7 @@
     }
   },
   "x-ms-parameterized-host": {
-    "hostTemplate": "{Endpoint}",
+    "hostTemplate": "{endpoint}",
     "useSchemePrefix": false,
     "parameters": [
       {