Eclipse(4.29) migration guide - updated migration extension content (#647)

Author: subyssurendran666

platform/org.eclipse.platform/intro/migrateExtensionContent.xml

@@ -3,8 +3,8 @@
   <!-- Extension to the SDK Migration Page. -->
   <extensionContent id="org.eclipse.platform" name="Eclipse Platform" 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="Eclipse Platform" url="http://org.eclipse.ui.intro/showHelpTopic?id=/org.eclipse.platform.doc.isv/porting/eclipse_4_28_porting_guide.html" id="platform">
-      		<text>Eclipse Platform 4.28 Plug-in Migration Guide</text>
+    	<link style-id="content-link" label="Eclipse Platform" url="http://org.eclipse.ui.intro/showHelpTopic?id=/org.eclipse.platform.doc.isv/porting/eclipse_4_29_porting_guide.html" id="platform">
+      		<text>Eclipse Platform 4.29 Plug-in Migration Guide</text>
     	</link>
      </group>
   </extensionContent>