[PL] Update Enum lesson to 1.3.0 (#1353)
[PL] Update Enum lesson to 1.3.0 (#1353)

* [PL] Update Enum lesson to 1.3.0

* Fix typos

* Some formating stuff

* Fix mispelling words

doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir_school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir-school,doomspork/elixir-school