Added documentation on best practices for creating clusters with HA m…

[jatan28]

Fix #3389

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[chrislovecnm]

This is awesome, but this is code that is self-generated. Should we move this into the docs section rather than the cli help? The cli help is actually generated from go code.

[jatan28]

@chrislovecnm Should I add it in the high_availability.md instead?

[chrislovecnm]

/ok-to-test
/lgtm

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Automatic merge from submit-queue.