DOC: make a note that writeRoutineEndCode does not save onset/offset times

[mh105]

I noticed this while working on some other things for SoundComponent, but it looks like the writeRoutineEndCode() method of BaseComponent doesn't actually write code when generating scripts from Builder to save onset/offset times at the end of a routine. Is this expected...? It's just that almost all components have this parameter, and it was surprising there isn't corresponding code gets written for it. I apologize in advance if this is mistaken, and feel free to close it.

[mh105]

@TEParsons Sorry is it correct that this part doesn't write any code...? Just want to make sure toggling the option of Save Onset/Offset Time under the Data tab does have an effect as intended. Perhaps it is now handled using a different mechanism using self.params['saveStartStop'] without adding a code section into the generated script? An example use is found here: I couldn't confirm whether that line has no effect whatsoever at the moment, so I just want to double check with you.