text: Title: Libdoc: Show type information of embedded paramters
  Body: When generating libdoc documentation, keywords with embedded arguments do not show the type hints. 
  
  This is a significant disadvantage to the "regular" parameter use case as in many cases the type information is clearer and more concise than free text would be.
  
  For example.:
  
  ```
  Write ${data} to ${destination}
  
  Types.:
     data = bytes
     destination = socket.socket | io.RawIOBase
  
  ```
  
  The types provide quite a bit of helpful information.
  
  I believe that release 7.3 is going to touch the libdoc code base close to this to implement [libdoc markdown](https://github.com/robotframework/robotframework/issues/5304), therefore I think this would be a good fit.
  
  