readme and default_validators.conf inconsistent use of dash/underscore

[tysonnorris]

e.g. for profile validation, the readme suggests dash:
set $validate_user_profile "on; path=/validate-user-profile; order=1; ";

but the default validators in apigateway use underscore (/validate_user_profile):
https://github.com/adobe-apiplatform/apigateway/blob/master/api-gateway-config/conf.d/includes/default_validators.conf#L82

I think some others are inconsistent as well