8366802: [lworld] jdk/javadoc/doccheck/checks/jdkCheckLinks.java fails since jdk-26+26

Reviewed-by: dsimms

Author: liach

src/java.base/share/classes/java/lang/classfile/Attributes.java

@@ -28,6 +28,7 @@
 import java.lang.classfile.attribute.*;
 
 import jdk.internal.classfile.impl.AbstractAttributeMapper.*;
+import jdk.internal.javac.PreviewFeature;
 
 /**
  * Attribute mappers for predefined (JVMS {@jvms 4.7}) and JDK-specific
@@ -250,8 +251,9 @@ public static AttributeMapper<LineNumberTableAttribute> lineNumberTable() {
 
     /**
      * {@return Attribute mapper for the {@code LoadableDescriptors} attribute}
-     * @since 23
+     * @since Valhalla
      */
+    @PreviewFeature(feature = PreviewFeature.Feature.VALUE_OBJECTS)
     public static AttributeMapper<LoadableDescriptorsAttribute> loadableDescriptors() {
         return LoadableDescriptorsMapper.INSTANCE;
     }