docs: add JSDoc comments to ReadonlySet interface #35779

Job	Run time
typecheck	36s
misc	29s
lint	1m 0s
package-size	1m 42s
self-check	53s
knip	31s
coverage	11m 40s
Test Node 24 on windows-latest	10m 24s
Test Node 24 on ubuntu-latest	8m 43s
smoke	53s
Test Node 14 on windows-latest	12m 21s
Test Node 14 on ubuntu-latest	13m 3s
format	24s
baselines	9m 2s
Test Node lts/* on ubuntu-latest with --no-bundle	10m 39s
required	4s
	1h 22m 24s

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