Bryan O'Sullivan committed 4bb10cf

Make actual use of the preface.

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+  &ch00;


       example can show up as having occurred during the same second.
       You can see this occur in the <literal
 	role="hg-ext">bisect</literal> example in section <xref
-	id="sec:undo:bisect"/>, for instance.</para>
+	linkend="sec:undo:bisect"/>, for instance.</para>
     <para id="x_88">So when you're reading examples, don't place too much weight
       on the dates or times you see in the output of commands.  But