grep: -k is not necessary for make test anymore

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11741 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/grep.xml

@@ -50,7 +50,7 @@
 
     <para>To test the results, issue:</para>
 
-<screen><userinput remap="test">make -k check</userinput></screen>
+<screen><userinput remap="test">make check</userinput></screen>
 
     <para>Install the package:</para>