Huh, I googled “julia student-t” and got to Univariate Distributions which is where Distributions.TDist is documented.
It’s true that this is not in the Julia manual itself, but that’s inherent to not having a single monolithic library, so I’m not sure what you are asking for here.
As I wrote in another thread
I think part of the issue here is that in an extremely well-established language like Python, there are large organizations with deep pockets that pour resources into a few high-profile packages in key problem areas. […] it is easier to identify a well-resourced solution.
That being said, there’s no question that more documentation could be written, and better documentation, and I agree that having more examples in the documentation is desirable.