Fix typo: occured -> occurred

[Rohan5commit]

Summary

Fixes a typo in a string in packages/react-devtools-shared/src/devtools/views/ErrorBoundary/ErrorBoundary.js: "occured" -> "occurred"

How did you test this change?

This is a single-character typo fix in a string. No code behavior changes.

Related issue

N/A - trivial typo fix

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