Parametrise these SSH docs

README.md

@@ -35,13 +35,11 @@ You can add the following to your SSH configuration:
 ```
 Host voicegardens.org
   Hostname voicegardens.org
-  User voicegardens
+  User <username>
   Port 12345
-  IdentityFile ~/.ssh/my-ssh-secret-key-file
+  IdentityFile ~/.ssh/<ssh-private-key-part>
 ```
 
-(Where you should replace "my-ssh-secret-key-file" with the real filename.)
-
 Make sure you can SSH into the server.
 
 ```bash