FMEPRD-281 Update Amazon S3 Integration Documentation

[alai97]

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Description

• Please describe your changes: Adds the output file schema for sending impressions from FME to S3. Conversation with Agus on Slack.
• Jira/GitHub Issue numbers (if any): https://harness.atlassian.net/browse/FMEPRD-281
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[rpierce99]

LGTM, one nitpick would be "File restrictions" since we're the ones putting the files in the bucket, there is probably a better description of the section

[dtk-DaveKarow]

LGTM

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