RFR: 8221991 : Improve the HTML for the inheritance tree for a type

[Priya Lakshmi Muthuswamy]

Hi,

Kindly review the fix for https://bugs.openjdk.java.net/browse/JDK-8221991
webrev : http://cr.openjdk.java.net/~pmuthuswamy/8221991/webrev.00/
structure:http://cr.openjdk.java.net/~pmuthuswamy/8221991/structure/HashMap.html

Existing Structure:
/<ul class="inheritance">//
//    <li><a href="../lang/Object.html" title="class in 
java.lang">java.lang.Object</a></li>//
//    <li>//
//        <ul class="inheritance">//
//            <li><a href="AbstractMap.html" title="class in 
java.util">java.util.AbstractMap</a>&lt;K,​V&gt;</li>//
//            <li>//
//                <ul class="inheritance">//
//<li>java.util.HashMap&lt;K,​V&gt;</li>//
//                </ul>//
//            </li>//
//        </ul>//
//    </li>//
//</ul>/

Current Structure :
<ul class="inheritance" title="Inheritance Tree">
    <li><a href="../lang/Object.html" title="class in 
java.lang">java.lang.Object</a></li>
    <li style="margin-left:2em"><a href="AbstractMap.html" title="class 
in java.util">java.util.AbstractMap</a>&lt;K,​V&gt;</li>
    <li style="margin-left:4em">java.util.HashMap&lt;K,​V&gt;</li>
</ul>

Thanks,
Priya