Minor documentation fix in IEx.Helpers
Minor documentation fix in IEx.Helpers

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