added missing vigr

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@1281 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

appendixa/shadowpwd-desc.xml

@@ -5,7 +5,7 @@
 dpasswd, expiry, faillog, gpasswd, groupadd, groupdel, groupmod, grpck, 
 grpconv, grpunconv, lastlog, login, newgrp, passwd, sg, su, logoutd, 
 mkpasswd, newusers, pwck, pwconv, pwunconv, useradd, 
-userdel, usermod and vipw programs.</para>
+userdel, usermod, vigr and vipw programs.</para>
 
 </sect2>