ErrorBoundary documentation issue

[Brendan-csel]

Describe the bug
The documentation suggests the ErrorBoundary callback form provides a printable error message...

<ErrorBoundary fallback={(err, reset) => <div onClick={reset}>Error: {err}</div>}>
  <MyComp />
</ErrorBoundary>

...however the err parameter is actually an error object which requires err.toString() to show a useful message...

<ErrorBoundary fallback={(err, reset) => <div onClick={reset}>Error: {err.toString()}</div>}>
  <MyComp />
</ErrorBoundary>

To Reproduce
Example with solution. Remove .toString() to see the problem.