Document terminology & make it consistent throughout the code

[JackKelly]

Need to standardise on words like the "recipes", what's a single "run", etc.

Maybe a run should be a single execution of Workload.run() against a specific Dataset.

[jmdelahanty]

Is this the kind of thing that I could maybe contribute to? Since I'm so new to performance interrogation and efficient storage it might take me some time to understand, but I'm happy to try!

[JackKelly]

That's a very kind offer! TBH, this issue is more about reminding me use consistent names throughout the code (rather than a documentation issue). Sorry, I should've explained more in the original description!