Move the Javadoc overview where the Maven Javadoc plugin expects it

Update from Doxia 1 to 2

pom.xml

@@ -126,7 +126,7 @@
     <commons.jacoco.branchRatio>0.78</commons.jacoco.branchRatio>
     <commons.jacoco.lineRatio>0.85</commons.jacoco.lineRatio>
     <commons.jacoco.complexityRatio>0.78</commons.jacoco.complexityRatio>
-    <doxia.module.markdown.version>1.12.0</doxia.module.markdown.version>
+    <doxia.module.markdown.version>2.0.0</doxia.module.markdown.version>
     <math.mathjax.version>2.7.9</math.mathjax.version>
     <commons.easymock.version>5.5.0</commons.easymock.version>
     <!-- PMD 7.9.0 throws java.io.IOException: Stream closed probably because PMD is shadding ASM. -->

src/main/javadoc/overview.html

@@ -28,19 +28,20 @@
      See also the {@code java.util} package for the standard Java collections.
   </p>
      
-  <h4>Main features</h4>
+  <h1>Main features</h1>
   <p>
      Commons-Collections defines a number of key interfaces:
   </p>
-  <table border="1" cellspacing="0" cellpadding="3">
-  <tr bgcolor="#CCCCFF" class="TableHeadingColor">
+  <table border="1">
+  <caption>Interfaces</caption> 
+  <tr class="TableHeadingColor">
     <th>Interface</th><th>Description</th>
   </tr>
   <tr>
     <td>
-      {@link org.apache.commons.collections.Bag}
+      {@link org.apache.commons.collections4.Bag}
     </td>
-    <td valign="top">
+    <td>
       A new {@code Collection} subinterface that stores each object together
       with the number of occurrences. Methods are provided to get the number of
       occurrences, and to add and remove a certain number of that object.
@@ -48,57 +49,48 @@
   </tr>
   <tr>
     <td>
-      {@link org.apache.commons.collections.Buffer}
+      {@link org.apache.commons.collections4.BidiMap}
     </td>
-    <td valign="top">
-      A new {@code Collection} subinterface that allows objects to be removed
-      in some well-defined order. Methods enable the next item to be peeked and removed.
-    </td>
-  </tr>
-  <tr>
     <td>
-      {@link org.apache.commons.collections.BidiMap}
-    </td>
-    <td valign="top">
       A new {@code Map} subinterface that allows lookup from key to value and
       from value to key with equal ease.
     </td>
   </tr>
   <tr>
     <td>
-      {@link org.apache.commons.collections.OrderedMap}
+      {@link org.apache.commons.collections4.OrderedMap}
     </td>
-    <td valign="top">
+    <td>
       A new {@code Map} subinterface that is used when a map has an order, but is
       not sorted. Methods enable bidirectional iteration through the map.
     </td>
   </tr>
   <tr>
     <td>
-      {@link org.apache.commons.collections.MapIterator}
+      {@link org.apache.commons.collections4.MapIterator}
     </td>
-    <td valign="top">
+    <td>
       A new {@code Iterator} subinterface specially designed for maps. This iterator
       avoids the need for entrySet iteration of a map, and is simpler to use.
     </td>
   </tr>
   <tr>
     <td>
-      {@link org.apache.commons.collections.ResettableIterator}
+      {@link org.apache.commons.collections4.ResettableIterator}
     </td>
-    <td valign="top">
+    <td>
       A new {@code Iterator} subinterface that allows the iteration to be reset back
       to the start. Many iterators in this library have this functionality.
     </td>
   </tr>
   <tr>
     <td>
-      {@link org.apache.commons.collections.Closure}<br />
-      {@link org.apache.commons.collections.Predicate}<br />
-      {@link org.apache.commons.collections.Transformer}<br />
-      {@link org.apache.commons.collections.Factory}<br />
+      {@link org.apache.commons.collections4.Closure}<br />
+      {@link org.apache.commons.collections4.Predicate}<br />
+      {@link org.apache.commons.collections4.Transformer}<br />
+      {@link org.apache.commons.collections4.Factory}<br />
     </td>
-    <td valign="top">
+    <td>
       A group of <i>functor</i> interfaces that provide plugin behavior to various
       collections and utilities.
     </td>