sysv usage: specify -n for dmesg to set loglevel

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11796 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter07/usage.xml

@@ -378,7 +378,7 @@ EOF</userinput></screen>
       <term>LOGLEVEL</term>
       <listitem>
         <para>This variable specifies the log level for kernel messages sent
-        to the console as set by <command>dmesg</command>. Valid levels are
+        to the console as set by <command>dmesg -n</command>. Valid levels are
         from "1" (no messages) to "8". The default level is "7".</para>
       </listitem>
     </varlistentry>