Be more specific about necessary configuration when using Xorg in a

VirtualBox FreeBSD guest.

PR:		190829
Submitted by:	Steven Doerfler <sgd-freebsdbugzilla@lugaru.com>

en_US.ISO8859-1/books/handbook/virtualization/chapter.xml

@@ -1053,16 +1053,26 @@ xenbr1          8000.feffffffffff   no                  vif0.1
       <programlisting>vboxguest_enable="YES"
 vboxservice_enable="YES"</programlisting>
 
-      <para>If &man.ntpd.8; or &man.ntpdate.8; is used, host time
-	synchronization should be disabled:</para>
+      <para>When <application>Xorg</application> will be used in the
+	guest, any required supporting services must also be enabled
+	just as if the guest was a physical machine.  Typically, these
+	lines would also be added to
+	<filename>/etc/rc.conf</filename>:</para>
+
+<programlisting>hald_enable="YES"
+dbus_enable="YES"</programlisting>
+
+      <para>See	<xref linkend="x-config"/> for details.</para>
+
+      <para>If &man.ntpd.8; or &man.ntpdate.8; is used, disable host
+	time synchronization:</para>
 
       <programlisting>vboxservice_flags="--disable-timesync"</programlisting>
 
-      <para>The <literal>vboxvideo</literal> driver should be
-	automatically recognized by <command>Xorg
-	  -configure</command>.  If not, modify
-	<filename>/etc/X11/xorg.conf</filename> for the
-	<application>&virtualbox;</application> video card:</para>
+      <para><application>Xorg</application> will automatically
+	recognize the <literal>vboxvideo</literal> driver.
+	It can also be manually entered in
+	<filename>/etc/X11/xorg.conf</filename>:</para>
 
       <programlisting>Section "Device"
 	### Available Driver options are:-