Replace `master` by `main` at https://support.torproject.org/apt/
Following the instructions at https://support.torproject.org/apt/ will fail with
E: The repository 'https://deb.torproject.org/torproject.org tor-nightly-master-bullseye Release' no longer has a Release file.
The reason, as hackerncoder pointed out, is that the release has changed from master to main. So
tor-nightly-master-<DISTRIBUTION> text should be replaced with
I'm not sure this issue belongs here or to https://gitlab.torproject.org/tpo/tpa/team/-/issues.