Axe some remaining &xfree86; for something more general.

PR:		docs/75070
Submitted by:	Joel Dahl <joel@automatvapen.se>

en_US.ISO8859-1/books/handbook/mac/chapter.sgml

@@ -2194,11 +2194,11 @@ XXX
     </sect2>
 
     <sect2>
-      <title>Cannot start &xfree86; after <acronym>MAC</acronym></title>
+      <title>Cannot start a X11 server after <acronym>MAC</acronym></title>
 
       <para>After establishing a secure environment with
 	<acronym>MAC</acronym>, I am no longer able to start
-	&xfree86;!</para>
+	X!</para>
 
       <para>This could be caused by the <acronym>MAC</acronym>
 	<literal>partition</literal> policy or by a mislabeling in
@@ -2219,7 +2219,7 @@ XXX
 	<step>
 	  <para>Double-check the label policies.  Ensure that the
 	    policies are set correctly for the user in question, the
-	    &xfree86; application, and
+	    X11 application, and
 	    the <filename class="directory">/dev</filename>
 	    entries.</para>
 	</step>