Update README.md with correct instruction for setting datadir #496

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Job	Run time
docker-build-check	6m 7s
docker-build-check	6m 7s
tests-windows (windows-2022)	24m 34s
tests-windows (windows-2022)	24m 34s
tests (ubuntu-20.04)	24m 12s
tests (ubuntu-20.04)	13m 32s
tests (macos-11)	17m 30s
tests (macos-11)	17m 30s
	2h 14m 6s