message: export Level from Heading API
diff: -type Level = 1 | 2 | 3;
  +export type Level = 1 | 2 | 3;
  export interface BaseHeadingProps {
  /**
  @@ -12,9 +12,8 @@ export interface BaseHeadingProps {
  */
  level?: Level;
  /**
  - * A custom accessibility role for this heading. Currently, only `presentation`
  - * is supported. `presentation` will strip the semantic meaning of the heading,
  - * but leave the visual styling intact.
  + * A custom accessibility role for this heading.
  + * `presentation` will strip the semantic meaning of the heading, but leave the visual styling intact.
  */
  role?: 'presentation';
  }
  