NOTE: this is currently work in progress. I am trying to see if I can modify the style to be more GitHub like

Right now, when a user changes various fields on the review request (only summary and description atm), we show a box that has both the new and old text. It will show what changed in a more usable manner.

Tested in my local linux machine with Chrome using the following steps
1. take a review request, change its description/testing done field
2. publish the change
3. see that the rendering for changes in description/testing done under "Review request changed" have been rendered in an interdiff style accordingly