Bug 574684 - Update JDT and Platform porting guide links for 4.21 in
Welcome page

Change-Id: Ic4648878e4324bd6e6864026c58a8cb2738a1569
Signed-off-by: Roland Grunberg <rgrunber@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt/+/182994
Tested-by: JDT Bot <jdt-bot@eclipse.org>
diff --git a/org.eclipse.jdt/intro/migrateExtensionContent.xml b/org.eclipse.jdt/intro/migrateExtensionContent.xml
index d015bc4..acdd0d3 100644
--- a/org.eclipse.jdt/intro/migrateExtensionContent.xml
+++ b/org.eclipse.jdt/intro/migrateExtensionContent.xml
@@ -3,8 +3,8 @@
   <!-- Extension to the SDK Migration Page. -->
   <extensionContent id="org.eclipse.jdt" name="Java development tools" alt-style="css/migrate.properties" style="css/migrate.css" path="migrate/@">
      <group id="content-group" style-id="content-group">
-    	<link style-id="content-link" label="Java development tools" url="http://org.eclipse.ui.intro/showHelpTopic?id=/org.eclipse.jdt.doc.isv/porting/eclipse_4_20_porting_guide.html" id="java">
-      		<text>Eclipse JDT 4.20 Plug-in Migration Guide</text>
+    	<link style-id="content-link" label="Java development tools" url="http://org.eclipse.ui.intro/showHelpTopic?id=/org.eclipse.jdt.doc.isv/porting/eclipse_4_21_porting_guide.html" id="java">
+      		<text>Eclipse JDT 4.21 Plug-in Migration Guide</text>
     	</link>
      </group>
   </extensionContent>