Added a nodump attribute.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@6981 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/shadow.xml

@@ -142,7 +142,7 @@ command.</para>
 <para>Choose a password for user <emphasis>root</emphasis> and set it
 by running:</para>
 
-<screen><userinput>passwd root</userinput></screen>
+<screen role="nodump"><userinput>passwd root</userinput></screen>
 </sect2>