Fix typos in Regex docs (#9353)
Fix typos in Regex docs (#9353)

[ci skip]
ggcampinho/elixir,pedrosnk/elixir,michalmuskala/elixir,kelvinst/elixir,kelvinst/elixir,kimshrier/elixir,elixir-lang/elixir,kimshrier/elixir,joshprice/elixir,pedrosnk/elixir,ggcampinho/elixir