chore: update ex_doc #289

Job	Run time
ash-ci / audit	5m 21s
ash-ci / mix igniter.upgrade	3s
ash-ci / mix deps.get	6m 49s
ash-ci / MIX_ENV=test mix.compile	5m 10s
ash-ci / mix docs	5m 6s
ash-ci / mix spark.formatter --check	4s
ash-ci / mix spark.cheat_sheets --check	55s
ash-ci / mix format --check-formatted	59s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix credo --strict	4s
ash-ci / mix sobelow	1m 3s
ash-ci / mix test	1m 24s
ash-ci / mix deps.unlock --check-unused	58s
ash-ci / MIX_ENV=dev mix.compile	2m 56s
ash-ci / mix dialyzer	8m 46s
ash-ci / Deploy docs to GitHub pages.	9s
ash-ci / Release	0s
	39m 47s

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