Clarify flyout options (#11750)
Fix up for the new options on this old PR.
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- User's documentation (`docs`):
https://docs--11750.org.readthedocs.build/en/11750/
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- Developer's documentation (`dev`):
https://dev--11750.org.readthedocs.build/en/11750/
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Co-authored-by: Manuel Kaufmann <humitos@gmail.com>
