[focusgroup] Add sections on scrolling and keyboard conflicts (#1289)
* Add key-conflict explanation and escape mechanism. Add small section on how this interacts with scrolling.
Update date.
* Update example
* update author guidance.
* Update site/src/pages/components/scoped-focusgroup.explainer.mdx
Co-authored-by: Philipp Gfeller <1659006+gfellerph@users.noreply.github.com>
* Add more explaination and examples, fix broken links.
* Add reference to open issue and potential workaround.
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Co-authored-by: Philipp Gfeller <1659006+gfellerph@users.noreply.github.com>