Errors on the map page

[roddyyaga]

Hey, I spotted a few mistakes on the page about maps (https://o1-labs.github.io/ocamlbyexample/basics-map.html)

• Maps in Core are not hashmaps, they are implemented with search trees. There are various important differences between the two, for instance in a hash table the keys must be hashable but in a search tree they need to be comparable instead. Core does have hashmaps as well in the Hashtbl module.
• "dictionnaries" has an extra n

Also, in the example code let balances = Map.empty (module String) I think it would be more idiomatic to do let balances = String.Map.empty. Many modules like String in Core have a specialised map submodule like this.

[mimoo]

Hey! Sorry for the slow reply, and thanks for pointing these out. Would you be interested in submitting a PR to provide these changes?