instanceIp --> username@instanceIp (#1921)

* instanceIp --> username@instanceIp

* [user]@<instance-ip>
Co-authored-by: NAnmol Sethi <hi@nhooyr.io>
Co-authored-by: NAnmol Sethi <hi@nhooyr.io>

doc/guide.md

@@ -134,13 +134,13 @@ Restart `code-server` with (assuming you followed the guide):
 systemctl --user restart code-server
 ```
 
-Now forward local port 8080 to `127.0.0.1:8080` on the remote instance.
+Now forward local port 8080 to `127.0.0.1:8080` on the remote instance by running the following command on your local machine.
 
 Recommended reading: https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding.
 
 ```bash
 # -N disables executing a remote shell
-ssh -N -L 8080:127.0.0.1:8080 <instance-ip>
+ssh -N -L 8080:127.0.0.1:8080 [user]@<instance-ip>
 ```
 
 Now if you access http://127.0.0.1:8080 locally, you should see `code-server`!