Fixed doc typos in Enum
Fixed doc typos in Enum

kimshrier/elixir,lexmag/elixir,joshprice/elixir,beedub/elixir,elixir-lang/elixir,ggcampinho/elixir,michalmuskala/elixir,beedub/elixir,kelvinst/elixir,antipax/elixir,gfvcastro/elixir,antipax/elixir,pedrosnk/elixir,ggcampinho/elixir,lexmag/elixir,pedrosnk/elixir,gfvcastro/elixir,kelvinst/elixir,kimshrier/elixir