Update README.md

Author: gaearon

packages/use-sync-external-store/README.md

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 # use-sync-external-store
 
-Backwards-compatible shim for [`React.useSyncExternalStore`](https://reactjs.org/docs/hooks-reference.html#usesyncexternalstore). Works with any React that supports hooks.
+Backwards-compatible shim for [`React.useSyncExternalStore`](https://reactjs.org/docs/hooks-reference.html#usesyncexternalstore). Works with any React that supports Hooks.
 
 See also https://github.com/reactwg/react-18/discussions/86.