Improve and/or operator docs
Improve and/or operator docs

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