Description of problem:

The existing documentation seems to indicate that zone entries need to be added
to a zone file whether the end user is using the included DNS server or an
external server.  The current content is:

"Once the installation process completes, update the DNS entries so that IPA
clients can discover the new server. For example, for an IPA replica with a
hostname of ipareplica.example.com:"

This should probably be changed to indicate that this is only necessary when
not using the included DNS server.