[docs] How does @ez.timeit decorator work?

[cboulay]

I tried adding it to a subscriber/publisher method but that crashed; _, task_info = self._tasks[func.__name__] doesn't work because self._tasks[func.__name__] is a single function, not a tuple. And the function doesn't have an .address so it can't be used for the fstring in the log call anyway.

If I fix the above, then the function returns immediately because it's actually returning the generator method it's wrapping.
That makes me think that it's only intended to be used in a standalone function / method that isn't called by the framework, but then I can't consolidate why it has setattr(func, TIMEIT_ATTR, True).

I'll make a separate wrapper for my own uses.