Update README.md

[MIJOTHY]

Clarify ROLE_ARN in example is not a magic string but a placeholder for a user's role arn.

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[MIJOTHY]

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[christopherhein]

@MIJOTHY can you sign the CLA?

[MIJOTHY]

I signed it

[christopherhein]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: christopherhein, MIJOTHY

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