Update lazy route discovery documentation

[arditdine]

I've just upgraded from Remix to React Router v7 and noticed that the CDN Caching documentation was not up to date.
Current route discovery uses paths and not p as query parameters.
That can be verified here: https://github.com/remix-run/react-router/blob/main/packages/react-router/lib/dom/ssr/fog-of-war.ts#L225
Unit tests are already updated to use match paths: https://github.com/remix-run/react-router/blob/main/integration/fog-of-war-test.ts#L718

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[remix-cla-bot]

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[brookslybrand]

Good catch! We updated this in #14321 but forgot to update this doc