[asm-cherry-pick] Clarify the doc of MethodInsnNode.owner

Cherry-pick of 97075ea

Author: lrytz

src/main/java/scala/tools/asm/tree/MethodInsnNode.java

@@ -45,6 +45,7 @@ public class MethodInsnNode extends AbstractInsnNode {
     /**
      * The internal name of the method's owner class (see
      * {@link scala.tools.asm.Type#getInternalName() getInternalName}).
+     * For methods of arrays, e.g., clone(), the array type descriptor.
      */
     public String owner;