docs(how-to/error-boundary): fix docs

[foxscotch]

I noticed this at work earlier while looking at the docs, thought it was funny but presumably not intended. figured I might as well open a PR for it! but feel free to just close this and commit the fix yourself if you'd like rofl

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[remix-cla-bot[bot]]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[timdorr]

Thanks! 💩