The documentation of '/etc/resolv.conf' and '/etc/hostname' should mention
the specifics of PMG (their content is used to create variables used in
the postfix configuration
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
`/etc/resolv.conf`::
-DNS search domain and nameserver setup.
+DNS search domain and nameserver setup. {pmg} uses the search domain setting
+to create the FQDN and domain name used in the postfix configuration.
`/etc/hostname`::
-The system's host name.
+The system's host name. {pmg} uses the hostname to create the FQDN used
+in the postfix configuration.
`/etc/hosts`::