DOC: Fix numpydoc section name Return -> Returns

[Carreau]

From a cursory glance this is the only place I found in sklearn (and to a wider extend scipy/numpy) that uses Return instead of Returns as described in the numpydoc format.

[rth]

Thanks @Carreau! There are a few more occurrences I think,

$ rg -U "Return\n\s+---" sklearn/
sklearn/mixture/_bayesian_mixture.py
53:    Return
54:    ------

sklearn/neighbors/_quad_tree.pyx
411:        Return
412:        ------

sklearn/tree/_criterion.pyx
192:        Return
193:        ------

sklearn/ensemble/_hist_gradient_boosting/binning.py
43:    Return
44:    ------

would you like to fix them as well?

[Carreau]

Ok, I need to be more careful with my grep-foo. I'll try to come around and fix those as well.

[GaelVaroquaux]

This is ready to merge. Should we merge this as is, and @Carreau can do another PR to finish?

I have this in mind in the interest of merging fast and decreasing the number of open PR.

[Carreau]

I have this in mind in the interest of merging fast and decreasing the number of open PR.

Thanks, I went down the rabbit hole of writing a tool that does auto formatting of docstrings, will send another PR later.