package.html: fix error reported by java 9 javadoc

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1812923 13f79535-47bb-0310-9956-ffa450edef68

Author: PascalSchumacher

src/main/java/org/apache/commons/codec/package.html

@@ -28,9 +28,9 @@
     simple framework for String encoding and decoding in three categories:
     Binary Encoders, Language Encoders, and Network Encoders. </p>
 
-    <h4><a name="Common Encoders">Binary Encoders</a></h4>
+    <h1><a name="Common_Encoders"></a></h1>
 
-    <table border="1" width="100%" cellspacing="2" cellpadding="3">
+    <table summary="Binary Encoders" border="1" width="100%" cellspacing="2" cellpadding="3">
   	  <tbody>
         <tr>
           <td> 
@@ -56,14 +56,14 @@ <h4><a name="Common Encoders">Binary Encoders</a></h4>
         </tr>
       </tbody>
     </table>
-    <h4> 
-      <a name="Language Encoders">Language Encoders</a> 
-    </h4>
+    <h1> 
+      <a name="Language_Encoders">Language Encoders</a> 
+    </h1>
     <p> 
       Codec contains a number of commonly used language and phonetic
       encoders
     </p>
-    <table border="1" width="100%" cellspacing="2" cellpadding="3">
+    <table summary="Language Encoders" border="1" width="100%" cellspacing="2" cellpadding="3">
       <tbody>
         <tr>
           <td> 
@@ -81,10 +81,10 @@ <h4>
         </tr>
       </tbody>
     </table>
-    <h4><a name="Network_Encoders">Network Encoders</a></h4>
-    <h4> </h4>
+    <h1><a name="Network_Encoders">Network Encoders</a></h1>
+    <h1> </h1>
     <p> Codec contains network related encoders </p>
-    <table border="1" width="100%" cellspacing="2" cellpadding="3">
+    <table summary="Network Encoders" border="1" width="100%" cellspacing="2" cellpadding="3">
       <tbody>
         <tr>
           <td>