Tag correction.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@4905 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/module-init-tools.xml

@@ -38,7 +38,7 @@ Coreutils, Diffutils, Flex, GCC, Glibc, Grep, M4, Make, and Sed</seg></seglistit
 <screen><userinput>make DOCBOOKTOMAN=""</userinput></screen>
 
 <!-- Edit me -->
-<para>The <command>DOCBOOKTOMAN</command> option allows the compile process to
+<para>The <envar>DOCBOOKTOMAN</envar> option allows the compile process to
 complete without regenerating the man pages.</para>
 
 <para>To test the results, issue: