Update README.md

roles/clone_on_prem_vm/README.md

@@ -40,7 +40,7 @@ all:
 
 All the variables defined in section ``Playbook Variables`` can be defined inside the ``vars.yml`` file.
 
-Create a ``playbook.ym`` file like this:
+Create a ``playbook.yml`` file like this:
 
 ```
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