Update react repo paths

[Duclearc]

I noticed the github urls are still mentioning the facebook repo.
I've updated them to point to the new react repo.

I used the Twitter announcement on June 15th 2026 as the "cutoff" date when the legacy docs should be left as they are vs. should have the new URL.

[meta-cla]

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[Duclearc]

The Meta CLA check should now be complete. ✔️