SSO doc correction

[alu-one]

Hi, regarding http://www.mailpiler.org/wiki/current:single-sign-on:

FYI, SSO with Firefox seems to use

network.automatic-ntlm-auth.trusted-uris

instead of

network.negotiate-auth.trusted-uris

Best regards, Daniel

[Janos SUTO]

Thanks, Daniel, I've fixed the docs.