fix: add a few more formatters/linters for markdown #2265

Job	Run time
change-detection / Identify source changes	9s
rr-tests / Action	16s
rr-tests / Run cog on README	15s
rr-tests / Check Python 3.10 on ubuntu-latest	35s
rr-tests / Check Python 3.10 on windows-latest	52s
rr-tests / Run pylint	16s
rr-tests / Check Python 3.14 on macos-15-intel	1m 12s
rr-tests / Check Python 3.12 on ubuntu-latest	34s
rr-tests / Check Python 3.14 on ubuntu-latest	35s
rr-tests / Check Python 3.10 on macos-15-intel	1m 34s
rr-tests / Check Python 3.14 on windows-latest	1m 5s
rr-tests / Check Python 3.14 on macos-latest	32s
rr-tests / Check Python 3.12 on macos-latest	30s
rr-tests / Check Python 3.10 on macos-latest	59s
rr-tests / Check Python 3.12 on windows-latest	52s
rr-tests / Check Python 3.12 on macos-15-intel	1m 31s
cookie	0s
pass	5s
	11m 52s

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