Restore Usage notes heading to fix broken anchors

Author: MUSKANNISHAD

files/en-us/web/html/reference/elements/dialog/index.md

@@ -44,7 +44,7 @@ This element includes the [global attributes](/en-US/docs/Web/HTML/Reference/Glo
     > [!NOTE]
     > While you can toggle between the open and closed states of non-modal dialog boxes by toggling the presence of the `open` attribute, this approach is not recommended. See {{domxref("HTMLDialogElement.open", "open")}} for more information.
 
-## Description
+## Usage notes
 
 - HTML {{HTMLElement("form")}} elements can be used to close a dialog box if they have the attribute `method="dialog"` or if the button used to submit the form has [`formmethod="dialog"`](/en-US/docs/Web/HTML/Reference/Elements/input#formmethod) set. When a `<form>` within a `<dialog>` is submitted via the `dialog` method, the dialog box closes, the states of the form controls are saved but not submitted, and the {{domxref("HTMLDialogElement.returnValue", "returnValue")}} property gets set to the value of the button that was activated.
 - The CSS {{cssxref('::backdrop')}} pseudo-element can be used to style the backdrop of a modal dialog, which is displayed behind the `<dialog>` element when the dialog is displayed using the {{domxref("HTMLDialogElement.showModal()")}} method. For example, this pseudo-element could be used to blur, darken, or otherwise obfuscate the inert content behind the modal dialog.