Added links to Regex docs
Added links to Regex docs

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