[Api Docs 2.0] Python Code Highlighting is not working inside API Docs/MDX

[hamelsmu]

cc: @obgibson

[obgibson]

The markdown module we are using for the attributes does not support syntax highlighting out-of-the-box. We could use a different module, or pull the more complex md out of attributes and into the children of MDX elements.

[hamelsmu]

@tuulos how critical is this feature? IIRC didn't sound terribly critical so I think we could close this one. WDYT?