Mention the GnuPG persistence feature in the gpgApplet documentation
Originally created by @sajolida on #6332 (Redmine)
The gpgApplet documentation [1] does not mention the GnuPG persistence feature [2]. That should be corrected, like it is done for the Pidgin documentation [3].
[1] https://tails.boum.org/doc/encryption_and_privacy/gpgapplet/
[2]
https://tails.boum.org/doc/first_steps/persistence/configure/#index2h2
[3] https://tails.boum.org/doc/anonymous_internet/pidgin/
Feature Branch: doc/gpgapplet_gnupg_persistence