Fix ignored docstring for Model{Missing} constructor

[knuesel]

Currently the help for Model doesn't show the documentation for the inner constructor Model{Missing}, due to JuliaLang/julia#16730 .

This PR fixes it using the @doc workaround mentioned in that issue.

With this PR, the Model{Missing} doc shows up at the top, before the struct Model doc. I hope it's not a problem.

[devmotion]

Oh, nice catch, I didn't know that it is problematic to add docstrings to inner constructors.

Maybe we could clean up and merge the three different docstrings for Model? I don't think it's helpful to copy-paste the struct definition, as done in the first docstring, and additionally the docstring for the model struct contains examples of the inner and outer constructor, so the division into 3 parts does not seem consistent. So my suggestion would be to have one docstring with all important information and examples attached to the struct but without the struct definition and only the signature of the constructors at the top.

[knuesel]

Sounds good, I'll try to come up with a proposal (though I'm quite a beginner with Turing 😊)

[yebai]

bors r+

[bors]

👎 Rejected by too few approved reviews

[yebai]

bors r+

[bors]

This PR was included in a batch that timed out, it will be automatically retried

[bors]

Timed out.