Fix "v3 docs" typo in README

[stephenwade]

Changes this:

Still on React Query v2? No problem! Check out the v2 docs here: https://github.com/TanStack/query/tree/2.x/docs/src/pages/doc​s.
Still on React Query v3? No problem! Check out the v3 docs here: https://tanstack​.com/query/v3/docs/. Still on React Query v4? No problem! Check out the v3 docs here: https://tanstack​.com/query/v4/docs/.

to this:

Still on React Query v2? No problem! Check out the v2 docs here: https://github.com/TanStack/query/tree/2.x/docs/src/pages/doc​s.
Still on React Query v3? No problem! Check out the v3 docs here: https://tanstack​.com/query/v3/docs/.
Still on React Query v4? No problem! Check out the v4 docs here: https://tanstack​.com/query/v4/docs/.

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