Add language fences around markdown code blocks #385

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	4m 27s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	49s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	58s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	57s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 16s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	55s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 52s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	58s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	2m 50s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 4s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 50s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	56s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 0s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 52s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	51s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 50s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	50s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 6s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	45s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 55s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 37s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 42s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	2m 7s
	36m 27s

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