fix `eda_` and `gateway_` role names in README #2990

Job	Run time
pre-commit_and_sanity / markdown-link-check	43s
pre-commit_and_sanity / build-import / build-import-collection	1m 2s
pre-commit_and_sanity / pre-commit / pre-commit	1m 9s
pre-commit_and_sanity / sanity / ansible stable-2.15 sanity	1m 10s
pre-commit_and_sanity / sanity / ansible stable-2.16 sanity	1m 3s
pre-commit_and_sanity / sanity / ansible stable-2.17 sanity	55s
pre-commit_and_sanity / sanity / ansible milestone sanity	1m 3s
pre-commit_and_sanity / sanity / ansible devel sanity	52s
pre-commit_and_sanity / all_green	1s
	7m 58s

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