fix: correct syntax error in menubar.md

[paulinek13]

This PR fixes a syntax error in menubar.md, addressing #1059. I decided to take it because the issue was marked with the "help wanted" label.

Closes #1059

[changeset-bot]

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Latest commit: e9fca5e

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[huntabyte]

Thank you!

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[huntabyte]

This was fixed in the next branch and merged into main so it should be good to go now, thank you for your contribution!