chore: updated jsdoc for label-only slot (#4607)

Co-authored-by: Rajdeep Chandra <rajdeepchandra@rajdeeps-mbp-2.macromedia.com>

Author: Rajdeepc

packages/action-menu/src/ActionMenu.ts

@@ -33,6 +33,7 @@ import { SlottableRequestEvent } from '@spectrum-web-components/overlay/src/slot
  * @slot - menu items to be listed in the Action Menu
  * @slot icon - The icon to use for Action Menu
  * @slot label - The label to use on for the Action Menu
+ * @slot label-only - The label to use for the Action Menu (no icon space reserved)
  * @slot tooltip - Tooltip to to be applied to the the Action Button
  * @attr selects - By default `sp-action-menu` does not manage a selection. If
  *   you'd like for a selection to be held by the `sp-menu` that it presents in