exitx -> exits

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@393 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

appendixa/shellutils-desc.xml

@@ -236,7 +236,7 @@ test checks file types and compares values.
 <sect3><title>true</title>
 
 <para>
-True always exitx with a status code indicating success.
+True always exits with a status code indicating success.
 </para>
 
 </sect3>