chore: update docs

docs/guide/nginx-proxy-example.md

@@ -36,7 +36,6 @@ server {
         proxy_set_header    Upgrade             $http_upgrade;
         proxy_set_header    Connection          $connection_upgrade;
         proxy_pass          http://127.0.0.1:9000/;
-        proxy_buffering     off;
     }
 }
 ```

docs/zh_CN/guide/nginx-proxy-example.md

@@ -36,7 +36,6 @@ server {
         proxy_set_header    Upgrade             $http_upgrade;
         proxy_set_header    Connection          $connection_upgrade;
         proxy_pass          http://127.0.0.1:9000/;
-        proxy_buffering     off;
     }
 }
 ```

docs/zh_TW/guide/nginx-proxy-example.md

@@ -36,7 +36,6 @@ server {
         proxy_set_header    Upgrade             $http_upgrade;
         proxy_set_header    Connection          $connection_upgrade;
         proxy_pass          http://127.0.0.1:9000/;
-        proxy_buffering     off;
     }
 }
 ```