docs: fix typo in ErrorBoundary message

[0xPedrop]

Summary

Fixed a spelling error in the ErrorBoundary component within React DevTools. The word "occured" was corrected to "occurred" in the fallback error message to ensure professional and correct terminology in the user interface.

How did you test this change?

This is a non-functional change to a static string. I verified the spelling correction manually in the source code. No logic was altered, so no existing tests should be impacted.

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