AWS region was missing in example (#213)

awsRegion missing in example.
It's not working without it.

And added cloudProvider setting.
It's by default "aws" and not necessary at the moment. But it's to important and should be defined if default will change in the future.

docs/autoscaling.md

@@ -14,6 +14,9 @@ rbac:
 
 sslCertPath: /etc/ssl/certs/ca-bundle.crt
 
+cloudProvider: aws
+awsRegion: YOUR_AWS_REGION
+
 autoDiscovery:
   clusterName: YOUR_CLUSTER_NAME
   enabled: true