Further testing of tooltip/popover

[matthewcarleton]

We need to test further what the tooltip and popover look like when in use. As far as I know we have yet to test this in any real world scenarios. There could be a separate issue to update depending on the findings of this test.

Also address issue #526 in this issue.
Additionally, the popover icon is impacted by #510 and needs updated.

[jgiardino]

Can we add aria-haspopup="dialog" to the toggle that displays a popover, as part of this?
Oh, nevermind. The wai-aria example of a modal doesn't even use this attribute. And I found this article that recommends not using it until support is better.

Also, it's possible that any updates for this issue would result in closing a related issue to update the documentation sections: #527