[DDF] Enable monitoring can be done also after installation. Current procedure describes only installation procedure no

Enable monitoring can be done also after installation. The current procedure describes only the installation procedure not enabling on a running instance. Enabling on running instances needs to patch config not apply which rewrites config.

Reported by: dhlavacd

https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.13/html/operating_3scale/monitoring-threescale#annotations:623fe181-e823-4196-b49c-ca828280a18d