correction to nginx conf

Installation.md

@@ -59,11 +59,7 @@ server {
     if ($host = chat.example.com) {
         return 301 https://$host$request_uri;
     } # managed by Certbot
-
-    if ($host = www.chat.example.com) {
-        return 301 https://$host$request_uri;
-    } # managed by Certbot
-
+    
     listen 80 ;
     listen [::]:80;
     server_name chat.example.com;
@@ -141,6 +137,7 @@ sudo systemctl status chatto
 ``` 
 and if it fails to start do 
 ```
+
 sudo journalctl -u chatto
 ``` 
 to check the cause of the failure.