improve rendering of builtin type docs #330

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	2m 45s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 10s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 32s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	2m 22s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 40s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	2m 22s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	2m 28s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 55s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	2m 58s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	2m 22s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	2m 47s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	2m 2s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 6s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 15s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 26s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 29s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 20s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 23s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 18s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 9s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 4s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 21s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 1s
	44m 15s

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