Fixing annotation and comment

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1655099 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/render/pdf/extensions/PDFEmbeddedFileElement.java

         return ELEMENT;
     }
 
-    /**
-     * Instantiates extension attachment object.
-     * @return extension attachment
-     */
+    @Override
     protected ExtensionAttachment instantiateExtensionAttachment() {
         return new PDFEmbeddedFileAttachment();
     }