Adding list_evaluations_setups() to API docs

[Neeratyoy]

Reference Issue

Adding the openml.evaluations.list_evaluations_setups to the api.rst for it to feature in the API docs.

[codecov-io]

Codecov Report

Merging #840 into develop will increase coverage by 0.85%.
The diff coverage is n/a.

@@ Coverage Diff @@## develop #840 +/- ##
===========================================
+ Coverage 88.02% 88.87% +0.85% 
===========================================
Files 36 36 Lines 4250 4531 +281 ===========================================
+ Hits 3741 4027 +286 + Misses 509 504 -5

Impacted Files	Coverage Δ
openml/extensions/sklearn/extension.py	94.03% <0%> (+2.74%)	⬆️

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