Update geocentroid aggregation.

[dwelsch-esi]

Description

Update descriptions, change examples. add parameter list, clarify (I hope) explanations.

Issues Resolved

Version

Frontend features

Checklist

• [x] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[dwelsch-esi]

@kolchfa-aws

[github-actions[bot]]

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[kolchfa-aws]

@bowenlan-amzn Could you please review this PR? Thanks!

[dwelsch-esi]

@kolchfa-aws Engineering comments resolved.

[dwelsch-esi]

@natebower Ready for approval.