Fix typo

docs/configuring-playbook-rest-auth.md

@@ -4,7 +4,7 @@ The playbook can now install and configure [matrix-synapse-rest-auth](https://gi
 
 See that project's documentation to learn what it does and why it might be useful to you.
 
-If you decide that you'd like to let this playbook install it for you, you need soem configuration like this:
+If you decide that you'd like to let this playbook install it for you, you need some configuration like this:
 
 ```yaml
 matrix_synapse_ext_password_provider_rest_auth_enabled: true