[spec] Fix missing limits subtyping rule #478

Job	Run time
build-js-api-spec	35s
build-core-spec	10m 39s
build-web-api-spec	36s
build-legacy-exceptions-core-spec	2m 8s
build-spec-versions	5s
build-legacy-exceptions-js-api-spec	33s
build-code-metadata-spec	4m 44s
publish-spec	20s
	19m 40s

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