Update matrix-stats aggregation.

[dwelsch-esi]

Description

Updated descriptions. Added explanation of result statistics.

This PR will probably require some major revisions before it's published. I have several questions. See line comments.

Issues Resolved

Version

Frontend features

Checklist

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[kolchfa-aws]

@jainankitk Could you please review this PR? Thanks!

[kolchfa-aws]

@jainankitk Thanks for your feedback. I addressed your comments and added a section about the missing parameter.