Add examples to some of the Kernel functions delegated to Erlang
Add examples to some of the Kernel functions delegated to Erlang

- Added examples of functions like `map_size/1`, `hd/1`, `tl/1` and a bunch of
  others

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