Give more context when prompting for additional workflow docs to prefetch

[AbhiPrasad]

bt/src/setup/mod.rs

Lines 897 to 916 in b9cc7d1

	fn prompt_instrument_workflow_selection() -> Result<Option<Vec<WorkflowArg>>> {
	let choices = ["observe", "evaluate"];
	let defaults = [true, false];
	let selected = MultiSelect::with_theme(&ColorfulTheme::default())
	.with_prompt("Select additional workflow docs to prefetch (instrument is always included)")
	.items(&choices)
	.defaults(&defaults)
	.interact_opt()?;
	Ok(selected.map(|indexes| {
	let mut workflows = vec![WorkflowArg::Instrument];
	for index in indexes {
	match index {
	0 => workflows.push(WorkflowArg::Observe),
	1 => workflows.push(WorkflowArg::Evaluate),
	_ => {}
	}
	}
	workflows
	}))
	}

? Select additional workflow docs to prefetch (instrument is always included) ›
✔ observe
⬚ annotate
✔ evaluate
⬚ deploy

we need to explain to the user what this is doing. Users brand new to braintrust have no clue what these workflow options mean.

[viadezo1er]

I'm fixing this in cedric/better-dx (not yet pushed to remote), will open a PR later