Simplify Popover Tab logic by using sentinel nodes instead of keydown event interception (#1440)

* improve `Popover` keyboard usage

Use `TabSentinel` instead of intercepting the `Tab` keydown events.

* use Buttons in Popover example

* update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ensure `DialogPanel` exposes its ref ([#1404](https://github.com/tailwindlabs/headlessui/pull/1404))
 - Ignore `Escape` when event got prevented in `Dialog` component ([#1424](https://github.com/tailwindlabs/headlessui/pull/1424))
 - Improve `FocusTrap` behaviour ([#1432](https://github.com/tailwindlabs/headlessui/pull/1432))
+- Simplify `Popover` Tab logic by using sentinel nodes instead of keydown event interception ([#1440](https://github.com/tailwindlabs/headlessui/pull/1440))
 
 ## [Unreleased - @headlessui/react]
 
@@ -20,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix closing of `Popover.Panel` in React 18 ([#1409](https://github.com/tailwindlabs/headlessui/pull/1409))
 - Ignore `Escape` when event got prevented in `Dialog` component ([#1424](https://github.com/tailwindlabs/headlessui/pull/1424))
 - Improve `FocusTrap` behaviour ([#1432](https://github.com/tailwindlabs/headlessui/pull/1432))
+- Simplify `Popover` Tab logic by using sentinel nodes instead of keydown event interception ([#1440](https://github.com/tailwindlabs/headlessui/pull/1440))
 
 ## [@headlessui/react@1.6.1] - 2022-05-03