doc/flatpak-info: add missing options
doc/flatpak-info: add missing options

Compared to `flatpak info --help` (which is what actually counts), 6
options were not documented, and one (--version) was documented but
doesn't exist.

Closes: #1788
Approved by: alexlarsson

matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak