Where to update current dash.testing docs?

[kwinkunks]

[Edit, I see now that this repo is 'issues only']

~I was going to update this table with wait_for_no_elements, among other things, but it looks like this is no longer the place to do it... at least, master seems out of step with the published docs. Where should I go instead?~

I suggest adding this line to the table of browser API calls:

    | `wait_for_no_elements(selector, timeout=None)` | explicit wait until an element is _not_ found; returns None. `timeout` if not set, equals the fixture's `wait_timeout` |