added descriptions to include Cosmos DB ARM template values

[WilliamAntonRohm]

per task 1158120

https://mseng.visualstudio.com/TechnicalContent/_queries/edit/1158120/?triage=true

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[WilliamAntonRohm]

#sign-off

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[mimig1]

These changes look good to me.

[lmazuel]

LGTM