Added command tags to patch.xml

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@6012 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/patch.xml

@@ -13,7 +13,8 @@
 
 <sect2 role="package"><title/>
 <para>The Patch package contains a program for modifying or creating files by
-applying a <quote>patch</quote> file typically created by the diff program.</para>
+applying a <quote>patch</quote> file typically created by the
+<command>diff</command> program.</para>
 
 <segmentedlist>
 <segtitle>&buildtime;</segtitle>