docs: Fix AshJson Link in getting-started-with-ash-and-phoenix.md (#266) #1049

Job	Run time
ash-ci / mix deps.get	4m 38s
ash-ci / mix igniter.upgrade	3s
ash-ci / audit	4m 25s
ash-ci / MIX_ENV=test mix.compile	4m 13s
ash-ci / mix format --check-formatted	23s
ash-ci / mix docs	2m 2s
ash-ci / Deploy docs to GitHub pages.	4s
ash-ci / mix spark.formatter --check	3s
ash-ci / MIX_ENV=dev mix.compile	4m 3s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix credo --strict	6s
ash-ci / mix dialyzer	7m 23s
ash-ci / mix sobelow	32s
ash-ci / mix spark.cheat_sheets --check	30s
ash-ci / mix test	58s
ash-ci / mix deps.unlock --check-unused	29s
ash-ci / Release	0s
	29m 52s

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