Modify 'times' argument in 'retry' to do what it says in the documentation

[YuvalEvron]

:param times: How many times to retry the function.

While in reality:

if isinstance(times, Timer):
        stopper = times  # a timer is a valid stopper
    elif isinstance(times, Duration):
        stopper = Timer(expiration=times)
    elif isinstance(times, int):
        stopper = ExpiringCounter(times)