message: Fix internal links in migration guide
diff: @@ -93,8 +93,8 @@ Keep in mind that this escape hatch is not meant as a way to permanently avoid t
  Other accessibility improvements include:
  -- Accessible modals and popovers, see [the dedicated section](#consolidated-modals-and-popovers)
  -- Semantic heading elements, see [the typography section](#heading-as-props)
  +- Accessible modals and popovers: see the [New modal and popover APIs](#new-modal-and-popover-apis).
  +- Semantic heading elements: see [Typography: Heading `as` props](#heading-as-props).
  ### New JSX transform
  