fix(docs): update nginx reverse proxy (#18104)

update nginx reverse proxy

docs/docs/administration/reverse-proxy.md

@@ -22,7 +22,7 @@ server {
     client_max_body_size 50000M;
 
     # Set headers
-    proxy_set_header Host              $http_host;
+    proxy_set_header Host              $host;
     proxy_set_header X-Real-IP         $remote_addr;
     proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;