[Bug]: Update comments recommending to use polyfill.io

[behnam-oneschema]

What version of React Router are you using?

main

Steps to Reproduce

In useSearchParams() impl we have:

react-router/packages/react-router-dom/index.tsx

Lines 1463 to 1472 in 2f25789

	typeof URLSearchParams !== "undefined",
	`You cannot use the \`useSearchParams\` hook in a browser that does not ` +
	`support the URLSearchParams API. If you need to support Internet ` +
	`Explorer 11, we recommend you load a polyfill such as ` +
	`https://github.com/ungap/url-search-params\n\n` +
	`If you're unsure how to load polyfills, we recommend you check out ` +
	`https://polyfill.io/v3/ which provides some recommendations about how ` +
	`to load polyfills only for users that need them, instead of for every ` +
	`user.`
	);

Expected Behavior

Another recommendation in place of:

      `If you're unsure how to load polyfills, we recommend you check out ` +
      `https://polyfill.io/v3/ which provides some recommendations about how ` +
      `to load polyfills only for users that need them, instead of for every ` +
      `user.`

Actual Behavior

N/A

[behnam-oneschema]

Context: https://www.sonatype.com/blog/polyfill.io-supply-chain-attack-hits-100000-websites-all-you-need-to-know

[udbhavgoyal-fareye]

This should be fixed by replacing the reference to polyfill.io with Cloudflare equivalent. Similiar fix has been implemented in thebuilder/react-intersection-observer#684

More details here - https://blog.cloudflare.com/automatically-replacing-polyfill-io-links-with-cloudflares-mirror-for-a-safer-internet

[brophdawg11]

Dup of #11733