Defaulting to v2 instead of v3 for the documentation selector in the upper right seems odd, especially considering the extent of the changes.
> defaulting to deprecated API documentation
I am not sure what point is being made here. This seems to be splitting hairs.
Regardless, it makes sense to default to the docs for the version which is considered to be officially released. That version is probably most likely to be used in a production application, which is usually what the docs are intended to support.