Remove warning about Man-DB's tests. They don't fail anymore.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9617 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/man-db.xml

@@ -83,10 +83,7 @@
 
    <para>To test the results, issue:</para>
 
-<screen><userinput remap="test">make -k check</userinput></screen>
-
-    <para>Note that 2 tests are known to fail as they rely on warnings output
-    from Groff, which changed slightly in Groff-1.21.</para>
+<screen><userinput remap="test">make check</userinput></screen>
 
     <para>Install the package:</para>