Fixed typos in Kernel docs
Fixed typos in Kernel docs

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