Chapter 11

[codingedgar]

Hi, thank you so much for this project! it is really helping me understand purescript 💛

Chapter 11 has this code:

typo

- `ordered-collections`, which provides data typs for immutable maps and sets
+ `ordered-collections`, which provides data types for immutable maps and sets 

at

purescript-book/text/chapter11.md

Line 11 in 18706f2

- `ordered-collections`, which provides data typs for immutable maps and sets

Example for the reader monad

While the Writer monad a very understandable example with a final PSCi demo, the reader does not, which is hard to follow, i I'm hoping that it explains itself later tho, but it would be nice to have some different demos (PSCi examples) of the reader monad.

[milesfrain]

We don't yet have a good PSCi example of using the reader monad.
If you'd like to create an example, I'd be happy to include it in the text. It could even be different than the current user/admin snippets.