Properly escape entity

The example value is supposed to be displayed as HTML entity, so we have
to escape the ampersand.  We also mark the example results as literals.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@343155 c90b9560-bf6c-de11-be94-00142212c4b1

reference/mbstring/functions/mb-substitute-character.xml

@@ -45,13 +45,13 @@
         <listitem>
          <simpara>
           <literal>"long"</literal>: Output character code value (Example:
-          U+3000, JIS+7E7E)
+          <literal>U+3000</literal>, <literal>JIS+7E7E</literal>)
          </simpara>
         </listitem>
         <listitem>
          <simpara>
           <literal>"entity"</literal>: Output character entity (Example:
-          &#x200;)
+          <literal>&amp;#x200;</literal>)
          </simpara>
         </listitem>
        </itemizedlist>