IDD service: Add note on reservoir change

[mortenfyhn]

Noticed this when trying to display the pump reservoir change info on my watch. Spec says that Pause is typically used during reservoir changes, but the 780G seems to use Stop.

[mortenfyhn]

I'll do some more captures to refine this. Will be back :)

[mortenfyhn]

Got a better capture now. The sequence for the IDD Status thru a set change (therapy control state, operational state, and reservoir attached flag, in that order):

1. normal operation (run, ready, reservoir attached)
2. reservoir out (stop, waiting, no reservoir attached)
3. priming (stop, priming, reservoir attached)
4. normal operation (run, ready, reservoir attached)

I think this can be good to have documented for people who may want to indicate e.g. states 2 and 3 on their device. For instance to make sure you don't forget a step such as the final fill cannula step (you're still on state 3 until that's done).