Oh the errors you are seeing are actually the wiki plugin for code references failing. Super sorry for broken tutorials, we all know how tough that can be.
This seems similar to this thread ->
https://answers.ros.org/question/10991/coderef-macro-fails-on-a-wiki-page/
I've reviewed the markup of the wiki page and can't seem to get it working. Maybe @tfoote knows the solution.
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