Corrected a typo in 'Additional Configuration' section

[van-adam]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Typo correction in the GUI configuration in section 'Additional configuration' What is the current behavior? (You can also link to an open issue here) Typo in GUI configuration What is the new behavior (if this is a feature change)? No typo in GUI configuration Additional info: