The guide pages under lib/elixir/pages are not doctests, so some example outputs drifted from what current Elixir prints. I re-ran each example on main (1.21.0-dev, OTP 29) with a clean IEx and updated the blocks to match the actual output. Also fixes two typos. Map ordering examples were left untouched since small-map print order is not guaranteed across OTP versions. Signed-off-by: Patric Vinicios <psdev7@gmail.com>