Document driverActionNecessary callback parameters

[pnc]

This is a partial change, since it's not clear to me what the boolean parameter indicates.

For instance, if you change your vehicle, the function is called with false, "Workflow". What does the boolean parameter mean?

[colonelchlorine]

@pnc still in dev. first parameter represents whether driver action is necessary (true for action started, false for action complete).

might switch it to two different event functions with a single 'action type' parameter that is being started / completed.

[pnc]

@colonelchlorine This shipped in 1804 and we're now relying on it in production code, based on Vik Sridhar's guidance, so this needs to stay stable.

What's the second parameter?

[colonelchlorine]

This is not in full release. You're doing a PR on a branch. Proceed with caution in production.

A string which represents the area of the application (e.g. "workflow" or "login")