[#2344] Fix documented default password (#2345)

The default password is not `sysadmin` anymore, it's `clab@123` as
stated lower in the document, too. This just cleans the last reference.

Co-authored-by: Benedikt Heine <benedikt.heine@3q.video>

docs/manual/kinds/generic_vm.md

@@ -34,7 +34,7 @@ docker exec -it <container-name/id> bash
 
 ///
 /// tab | CLI via SSH
-to connect to the Linux shell (password `sysadmin`)
+Connect to the VM Guest via SSH. Default password see below the [Credentials](#credentials).
 
 ```bash
 ssh clab@<container-name>