docs: browser example for marked on page data (#3864)

* docs: browser example for marked on page data

* Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* docs: browser example to USING_ADVANCED.md

* Update docs/USING_ADVANCED.md

Applied suggestion. Thank you.

Co-authored-by: Tony Brix <tony@brix.ninja>

* docs: update menu, close user ex details

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Tony Brix <tony@brix.ninja>