And add some more cases.

we can make this a different and better policy if we want, but now
we have something to start from.

i'm not sure what the best simple phrase is, but 'shared irc host'
might be better

it's basically the same process as other sysadmin changes

they were producing broken links of the form
https://help.torproject.org/tsa/doc/accounts/|https://db.torproject.org/login

Might resolve ticket 11308

 * ADD a SEE ALSO pointer in the "Getting added to an existing group/Getting
   access to a specific host" section to the "Host specific passwords"
   section.

 * We don't *actually* want to email changes@db.debian.org, as funny as it
   would be every time a new Tor developer did it.

 * ADD warning to other devs about the wild goose change that is
   changes@db.tpo.