ninja: don't use <command> just for emphasis

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@12095 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter08/ninja.xml

@@ -58,11 +58,7 @@
 
     <para>Using the <emphasis>optional</emphasis> procedure below allows a user to
     limit the number of parallel processes via an environment variable, 
-    NINJAJOBS.  <command>For example</command>, setting:
-
-     <!--Using <command> here to make the output bold.  We really don't want
-     users setting this now and experience shows that many users blindly
-     copy/paste anything in a box. -->
+    NINJAJOBS.  <emphasis role="bold">For example</emphasis>, setting:
 
     <screen>export NINJAJOBS=4</screen>