[whatwg-url] update specification link for percentDecodeString()

[azerum]

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[typescript-bot]

@azerum Thank you for submitting this PR! I see this is your first time submitting to DefinitelyTyped 👋 — I'm the local bot who will help you through the process of getting things through.

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• whatwg-url — on npm, on unpkg

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[typescript-bot]

🔔 @aomarks @ExE-Boss @BendingBender — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.