Fix error in EEx docstring ("a macro" to "an expression")
Fix error in EEx docstring ("a macro" to "an expression")

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