docs: fix broken doc links. #1786

Job	Run time
mix deps.get	23s
mix hex.audit	21s
MIX_ENV=test mix.compile	32s
mix git_ops.check_message	36s
mix credo --strict	31s
mix dialyzer	39s
mix doctor --full --raise	40s
mix format --check-formatted	27s
mix ash_postgres.generate_migrations --check	32s
mix sobelow --config	40s
mix spark.cheat_sheets --check	27s
mix spark.formatter --check	28s
mix test	3m 17s
mix deps.unlock --check-unused	37s
MIX_ENV=dev mix.compile	42s
mix docs	30s
Deploy docs to GitHub pages.	9s
	11m 31s

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