add comments in xml code example

Example 1: xml comments

<!-- This is a XML comment. -->

Example 2: xml comment

<detail>
    <band height="20">
    <!--
      Hello,
         I am a multi-line XML comment
         <staticText>
            <reportElement x="180" y="0" width="200" height="20"/>
            <text><![CDATA[Hello World!]]></text>
          </staticText>
      -->
     </band>
</detail>

Example 3: comments in xml

<!--Your comment-->