Some model docstrings have "unknown" in them

[ablaom]

It looks like some models are defining their docstrings before their metadata has been defined (in particular, before package_name has been defined) because we are seeing "unknown" where the package name should appear. That is, the order of operations documented here has not been applied.

Here's an example:

I have not exhaustively checked the docstrings to see which ones are wrong, but it looks like there are several that need fixing.