Anchors inside callouts within documentation markdown

[jasonsturges]

Changing your indention to 2 spaces would render links correctly inside these alerts:

<div class="@ns-callout @ns-intent-danger @ns-icon-error">
    <h4 class="@ns-heading">Centering the component</h4>
    **Do not center this component** using `text-align: center`, as it will cause an infinite loop
    in the browser ([more details](https://github.com/JedWatson/react-select/issues/540)). Instead,
    you should center the component via flexbox or with `position` and `transform: translateX(-50%)`.
</div>

Above, the "more-details" link would interpret correctly if implemented as follows:

<div class="@ns-callout @ns-intent-danger @ns-icon-error">
  <h4 class="@ns-heading">Centering the component</h4>

  **Do not center this component** using `text-align: center`, as it will cause an infinite loop
  in the browser ([more details](https://github.com/JedWatson/react-select/issues/540)). Instead,
  you should center the component via flexbox or with `position` and `transform: translateX(-50%)`.
</div>

[adidahiya]

Nice, thanks for the suggestion! Same issue as #3487 but I'll leave this one open.