Bug#457708: add example of fully qualified domain name

[jidanni@jidanni.org]

!Common Problems
!===============
!
!1) Error message "Could not determine the server's fully qualified domain name,
!using 127.0.0.1 for ServerName" during start
!
!This can usually be ignored but it means that Apache httpd was unable to obtain
!a fully-qualified hostname by doing a reverse lookup on your server's IP
!address. You may want to add the fully-qualified hostname to /etc/hosts .

Which is a science in itself. So you might want to add an example.
Else it is easy to affect a lot of other programs, who's names I forgot.
Here's what worked for me:

127.0.0.1 jidanni2.jidanni.org localhost jidanni2

I tried to get them to add such an example to hosts(5), but they said no.