Update setting_up_s3_bucket_policies.md
Update setting_up_s3_bucket_policies.md

The `"Version": "2017-06-20",` is invalid according to the S3 bucket policy editor (error of `The policy must contain a valid version string`.) The policy doesn't need it.
Modularfield/pageflow,tf/pageflow,codevise/pageflow,codevise/pageflow,tf/pageflow,codevise/pageflow,tf/pageflow,Modularfield/pageflow,tf/pageflow,Modularfield/pageflow,codevise/pageflow,Modularfield/pageflow