Cloudwatch: Docs improvements (#20100)

* Add Service Quota part

* Update docs after pr feedback

* Describing new features

* Divide into subheaders

* Changes after feedback

* cloudwatch: add min time interval section to docs

* docs: json format fix

* cloudwatch: move min time interval section in docs

* cloudwatch: docs fix

* docs: cloudwatch fixes

* docs: s/you are/you're

* docs: Cloudwatch - escapes underscores in tables