Rewrite Clustering Documentation

[dutchrapley]

Rewrite clustering documentation, ensuring to include documentation in regards to recoverExecutions.

[fdevans]

This is great, but we need a bit more content to make this actionable. Do you have content already prepared? Sections that we can focus on in smaller bites?

[fdevans]

Is this done? I know we looked at Clustering recently, but not sure if we addressed @dutchrapley's specific request