Copy upstream documentation change about regex ascii character class deficiency (#10757)
Copy upstream documentation change about regex ascii character class deficiency (#10757)

https://github.com/erlang/otp/pull/4551
ggcampinho/elixir,kelvinst/elixir,ggcampinho/elixir,kelvinst/elixir,joshprice/elixir,pedrosnk/elixir,kimshrier/elixir,kimshrier/elixir,pedrosnk/elixir,michalmuskala/elixir,elixir-lang/elixir