docs(ecs): Update IAM role requirements as of Spinnaker 1.19 (#1789)
docs(ecs): Update IAM role requirements as of Spinnaker 1.19 (#1789)

* docs(ecs): Update role requirements as of Spinnaker 1.19

* Update setup/install/providers/aws/aws-ecs.md

Co-Authored-By: Dave Dorbin <3a983b921291999521a653180c5b82ccd2c36700@google.com>

Co-authored-by: Dave Dorbin <3a983b921291999521a653180c5b82ccd2c36700@google.com>
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