message: Add missed documentation
diff: @@ -2,6 +2,7 @@ import type { ConfiguredDocumentClass } from '../../../types/helperTypes';
  declare global {
  /**
  + * A simple application which supports popping a ChatMessage out to a separate UI window.
  * @typeParam Options - the type of the options object
  */
  class ChatPopout<Options extends Application.Options = Application.Options> extends Application<Options> {
  