Correction to immutable page

[Alberto Salvia Novella]

(https://help.ubuntu.com/16.04/serverguide/dovecot-server.html)
(https://help.ubuntu.com/community/Dovecot)

I won't delete the community edited page just because it looks like 
people actually are completing it with more useful information.

But perhaps we could remove the information that is also in the server 
guide and just refer to it. That way everything would be updated and 
complete.


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