[spec] Group reference instructions more consistently #1

Job	Run time
build-legacy-exceptions-js-api-spec	35s
build-legacy-exceptions-core-spec	2m 8s
build-spec-versions	6s
build-web-api-spec	33s
build-core-spec	10m 53s
build-js-api-spec	36s
build-code-metadata-spec	3m 10s
publish-spec	21s
	18m 22s

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