Added summary friendly docs to System
Added summary friendly docs to System

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