Update ssrf_proxy related doc link in docker-compose file (#7778)

docker/docker-compose.yaml

@@ -294,7 +294,7 @@ services:
 
   # ssrf_proxy server
   # for more information, please refer to
-  # https://docs.dify.ai/learn-more/faq/self-host-faq#id-18.-why-is-ssrf_proxy-needed
+  # https://docs.dify.ai/learn-more/faq/install-faq#id-18.-why-is-ssrf_proxy-needed
   ssrf_proxy:
     image: ubuntu/squid:latest
     restart: always