feat: update example

Author: weaigc

render.yaml

@@ -6,9 +6,7 @@ services:
   healthCheckPath: /api/healthz
   plan: free
   envVars:
-  - key: BING_UA
-    value: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36 Edg/115.0.0.0
-  - key: BING_COOKIE
+  - key: BING_HEADER
     value:
   - key: PORT
     value: 10000