Make it clear that Pulse Audio is potentially dangerous to enable.
Per "Jann Horn of Google Project Zero", PulseAudio is a potential vector for sandbox escapes. While this is not part of the threat model in current releases, it should be documented as such in the UI.
The documentation has been updated to note this possibility: https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser/Sandbox/Linux?action=diff&version=22