Use DAX.Guide descriptions for Intellisense vs MS descriptions

Perfect example of what I have to look up - EXCEPT. When I am evaluating relationships I use EXCEPT in the DAX Query tool quite often. DAX Studio uses DAX.Guide, which helpfully says: Returns the rows of left-side table which do not appear in right-side table. It seems TE/3 uses the MS definition here, which is less clear. Returns the rows of one table which do not appear in another table. But which is which? The first and not the second, or second and not first? DAX.Guide nails it. (in fairness, I have added an edit request to this to MS's docs, but still think overall DAX.Guide has better definitions.)