docs: add missing closing `]` in guide (#254) #1017

Job	Run time
ash-ci / mix deps.get	53s
ash-ci / audit	48s
ash-ci / mix igniter.upgrade	1m 24s
ash-ci / MIX_ENV=test mix.compile	35s
ash-ci / mix docs	28s
ash-ci / mix format --check-formatted	30s
ash-ci / mix spark.cheat_sheets --check	1m 10s
ash-ci / Deploy docs to GitHub pages.	3s
ash-ci / mix spark.formatter --check	4s
ash-ci / MIX_ENV=dev mix.compile	26s
ash-ci / mix credo --strict	6s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix dialyzer	5m 16s
ash-ci / mix sobelow	36s
ash-ci / mix test	1m 42s
ash-ci / mix deps.unlock --check-unused	30s
ash-ci / Release	0s
	14m 31s

Provide feedback