Add a perl command description

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9222 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/perl.xml

@@ -217,7 +217,8 @@
       <varlistentry id="cpanp-run-perl">
         <term><command>cpanp-run-perl</command></term>
         <listitem>
-          <para>Perl script that (description needed)</para>
+          <para>Perl script that used to enable flushing of the output 
+          buffer after each write in spawned processes</para>
           <indexterm zone="ch-system-perl cpanp-run-perl">
             <primary sortas="b-cpanp-run-perl">cpanp-run-perl</primary>
           </indexterm>