Fix typos and minor edits

scalawithcats / scala-with-cats

Source code for Scala with Cats

http://underscore.io/books/scala-with-cats

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Open rudwna opened 5 years ago

rudwna commented 5 years ago

Changes with more than few chars include:

[Semigroupal] Edit the description of mapN to be more aligned with Semigroupal and Functor described before
[Validation case study] Discard unused val, this help the reader understands better
[Monad Transformers] Remove text that describe usage of fold