Update React Native DevTools docs link

[KingAmo]

Summary

https://reactnative.dev/docs/react-devtools do not exist
the correct link should be https://reactnative.dev/docs/react-native-devtools

Test plan

Upstreaming plan

• This commit should be sent as a patch to the upstream devtools-frontend repo. I've reviewed the contribution guide.
• This commit is React Native-specific and cannot be upstreamed.

[huntie]

@KingAmo Thanks! This was actually covered by a redirect from the old page timed with the 0.76 website update. There was a brief gap where this may have been broken.

Regardless, I think we can now update this 👍🏻