[Pewpewarrows]

Your argument might have some merit, except that you could apply it to almost anything and get non-sensical results. Django for example has close to half of the activity that Ruby on Rails does. Does that mean that Rails has severely worse documentation or APIs? Doubtful.

The more developers use a piece of technology, the more that will have questions about said technology. Poor documentation will certainly lead to more questions, but you can't look at these graphs and have any real data to support your case one way or the other.