Fix docstring lints as reported by internal linter.

[reventlov]

No description provided.

[EricRahm]

I wonder if we can run these checks in ci, I'm not a huge fan of them in the first place but I get that downstream wants them.

[reventlov]

I wonder if we can run these checks in ci, I'm not a huge fan of them in the first place but I get that downstream wants them.

I like the lint that makes sure that docstrings are correctly formatted when present. I'm not a big fan of requiring a docstring on every single function, especially private functions, but I didn't feel like being picky on this particular PR.

Downstream, the lints are an annoyance, but not a major problem. It should also be possible to turn them off, but I haven't taken the time to figure out how.