docs: improve Math.sign JSDoc grammar and clarity #35644

Job	Run time
browser-integration	1m 56s
package-size	1m 47s
misc	26s
typecheck	1m 8s
smoke	1m 17s
Test Node 24 on ubuntu-latest	8m 38s
Test Node 14 on windows-latest	14m 30s
baselines	8m 58s
format	17s
Test Node 24 on windows-latest	10m 44s
self-check	1m 6s
knip	33s
coverage	11m 49s
Test Node 14 on ubuntu-latest	11m 59s
lint	1m 10s
Test Node lts/* on ubuntu-latest with --no-bundle	11m 11s
required	3s
	1h 27m 32s

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