docs: add JSDoc comments to ReadonlySet interface #35677

Job	Run time
package-size	1m 35s
lint	56s
format	28s
knip	32s
self-check	48s
coverage	11m 26s
misc	26s
typecheck	43s
baselines	9m 9s
Test Node 14 on windows-latest	14m 22s
browser-integration	1m 18s
smoke	58s
Test Node 24 on windows-latest	11m 2s
Test Node 14 on ubuntu-latest	12m 4s
Test Node 24 on ubuntu-latest	8m 39s
Test Node lts/* on ubuntu-latest with --no-bundle	10m 56s
required	3s
	1h 25m 25s

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