Fix fit docs

[ParadaCarleton]

fit doesn't need a specific docstring just for Beta.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.96%. Comparing base (818814f) to head (08ad0fb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1746   +/-   ##
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  Coverage   85.96%   85.96%           
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  Files         144      144           
  Lines        8647     8647           
=======================================
  Hits         7433     7433           
  Misses       1214     1214           

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[ParadaCarleton]

Any objections to merging this?

[jaksle]

I mentioned this in Issue #1701. For sure docstring for Beta should be removed, but currently fit has no general docstring for a distribution fit. The question is should it be added.

[devmotion]

IMO we should add a docstring for generic fit, if this can be done in a clear and informative way, before removing the docstring for Beta. The possible problem with a generic docstring is that it is not clear which distributions are supported and what the (keyword) arguments are for the individual distributions.

[i9e1]

maybe related #1748

I assume now that Poisson is not supported as stated in doc of fit_mle.

[ParadaCarleton]

Anything else to do before merging?

[ParadaCarleton]

Anything else or can I merge?

[devmotion]

Is the docstring included in the docs?

[ParadaCarleton]

Anything else?

[ParadaCarleton]

@devmotion should I merge?

[ViralBShah]

Merge?

[devmotion]

Why was this merged? Docs seem to be broken (missing docstrings): https://juliastats.org/Distributions.jl/dev/fit/