[DDF] S3 region and S3 bucket are now defined in aws secret

S3 region and S3 bucket are now defined in aws secret

Remove please the sentence since it no longer holds.

Reported by: ficap_devel

https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.13/html/installing_3scale/install-threescale-on-openshift-guide#annotations:b8740771-592c-4f63-afaa-dd8abfe457da

ficap_devel I guess this is for here since the above link doesn't work: https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.13/html/installing_3scale/install-threescale-on-openshift-guide#amazon_s3_secret

However, I think this might no longer be relevant due to the work in THREESCALE-3820.