[spec] Fix binary code of `noexn` in appendix (#2022) #475

Job	Run time
build-code-metadata-spec	4m 19s
build-core-spec	13m 33s
build-legacy-exceptions-js-api-spec	35s
build-web-api-spec	36s
build-legacy-exceptions-core-spec	4m 11s
build-js-api-spec	33s
build-spec-versions	7s
publish-spec	22s
	24m 16s

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