I don't see where else to break `start_event_loop.__doc__ = FigureCanvasBase.start_event_loop_default.__doc__`.  

The other thought I had was to do something like
```
_shortname = FigureCanvasBase.start_event_loop_default
start_event_loop.__doc__ = = _shortname.__doc__
del _shortname
```
but that just seems absurd