I've created a Firefox add-on called "Compare MoodleDocs" [1]. Here is what it does: Visit "view source" of any page within the MoodleDocs, right-click the textarea containing the source code of the page, select "compare this MoodleDoc with" plus the version to compare with. The Diff Checker will open and visualize the differences.
[1] https://addons.mozilla.org/de/firefox/addon/compare-moodledocs/
Feel free to install the add-on on your Firefox and use it. If it is useful to you, write a review back at the add-on's page [1]. This will help me to pass the review process [2] for my Firefox add-on. It has passed the preliminary review but for public listing a full review is necessary, which requires more active users and user reviews...
[2] https://addons.mozilla.org/en-US/developers/docs/policies/reviews