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add link to https://flatpak.github.io/xdg-desktop-portal/portal-docs.html which is more recent and comprehensive; hope that's OK.
Deleted "Note that the filechooser portal is not present in flatpak.git yet", surely it's been implemented for some time. (The page was last updated June 2016).
Updated Portals (markdown)
Updated Document and Content Portals (markdown)