added not to network config page to remove the network symlinks if no NIC present

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@1793 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter07/network.xml

@@ -5,6 +5,12 @@
 <para>This section only applies if you're going to configure a network
 card.</para>
 
+<para>If you don't have any network cards, you are most likely not going to
+create any configuration files relating to network cards. If that is the
+case, you must remove the <filename>network</filename> symlinks from all the
+runlevel directories
+(<filename class="directory">/etc/rc.d/rc*.d</filename>)</para>
+
 <sect2>
 <title>Configuring default gateway</title>