PowerBI Apiary not working - points to "polls API"

The PowerBI Apiary (https://powerbi.docs.apiary.io/) has been pointing to a "polls" API for over two weeks now.

Although it's currently not usable, it's still being referenced from the Power BI Developers page (https://powerbi.microsoft.com/en-us/developers/) as well as from Microsoft's 20778 course (an important part of module 8 in the training about "The Developer API" is using Apiary.io) 

Will this be fixed on a short term, or should all references be removed?