docs: updated nginx tunning section with modification allowing custom https port to work.

- fixes  #5408

docs/admin/nginx-tuning.rst

@@ -1,33 +1,33 b''
 .. _nginx-tuning:
 
 Nginx Tuning
 ------------
 
 Set the following properties in your ``/etc/nginx/proxy.conf`` so it does not
 timeout during large pushes.
 
 .. code-block:: nginx
 
     proxy_redirect              off;
-    proxy_set_header            Host $host;
+    proxy_set_header            Host $http_host;
 
     ## needed for container auth
     # proxy_set_header            REMOTE_USER $remote_user;
     # proxy_set_header            X-Forwarded-User $remote_user;
 
     proxy_set_header            X-Url-Scheme $scheme;
     proxy_set_header            X-Host $http_host;
     proxy_set_header            X-Real-IP $remote_addr;
     proxy_set_header            X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header            Proxy-host $proxy_host;
     proxy_buffering             off;
     proxy_connect_timeout       7200;
     proxy_send_timeout          7200;
     proxy_read_timeout          7200;
     proxy_buffers               8 32k;
     # Set this to a larger number if you experience timeouts
     client_max_body_size        1024m;
     client_body_buffer_size     128k;
     large_client_header_buffers 8 64k;
     add_header X-Frame-Options SAMEORIGIN;
     add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";