Update u_and_e.md

just formatting of {}

docs/u_and_e.md

@@ -508,7 +508,8 @@ map $http_upgrade $connection_upgrade {
 
     proxy_set_header Connection "";
     proxy_buffers 32 4k;
-    proxy_pass http://portainer/;   }
+    proxy_pass http://portainer/;
+  }
 
   location /portainer/api/websocket/ {
     proxy_http_version 1.1;