dangerousness for sendmail auth undocumented

[Former user]

The dangerousness of email auth attacks is twice that of any other attack. This isn't documented. It seems better for the default level to be the same for all services.

sendmailmsg:
   SENDMAIL_RELAYDENIED_PREF addr SENDMAIL_RELAYDENIED_SUFF;
   | SENDMAIL_AUTHFAILURE_PREF addr SENDMAIL_AUTHFAILURE_SUFF { attack->dangerousness *= 2; } ;
   ;

[Kevin Zheng]

Fixed in 2884d37, thanks!