[Tails-dev] thunderbird documentation to update for Tails 5

Hi,

on https://tails.boum.org/doc/anonymous_internet/thunderbird/index.en.html

"Passwords and Keys utility" is still mentioned while it has been
replaced by Kleopatra in Tails 5.

Documentation update seems needed.

PS: I hope this is the good place to report documentation issues, if not
please let me know.

PS2: If needed I can join/help with the Tails documentation.
(not often, but sometimes I sit for a day on the computer and can
improve some documentation stuff)
--
conan