Need ability to see what the props inherit from.

[dlabaj]

With more consumers using the documentation framework, we need the ability to see if props extend an existing props. Currently this is not supported. PF extensions can not see what props are missing if the extend props as shown here. In the example above trying to include the props for EmpyState from react-core currently does not work.

Suggested solution is to add this ability to the md file, and allow it link back to the PF component documentation that it's extending.