Add more doctest to `Monad` and `FlatMap`#4427

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diogocanut wants to merge 7 commits intotypelevel:mainfrom

diogocanut:flatMap-monad-doctest

Commits on Apr 12, 2023

Wip: doctests for FlatMap and Monad
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Commits on Apr 17, 2023

Commits on May 20, 2023

Merge branch 'main' of github.com:diogocanut/cats into flatMap-monad-doctest
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improve ifM doctests, add string instead of boolean
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Commits on Aug 22, 2023

Using State instead of StateT
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