Revert a minor change

docs/install.md

@@ -318,7 +318,5 @@ sudo udevadm control --reload
 
 Then, you will need to unplug and replug the key for the rule to trigger.
 
-## Testing the key
-
 To test whether the installation was successful, visit a
 [demo website](https://webauthn.io/) and try to register and login.