Corrected typo in toggle theme shortcut

Editor assessment

Mostly sound: `fix` is appropriate if the shortcut label or binding was genuinely wrong, and the subject pinpoints the affected feature ('toggle theme shortcut'). The style slips are 'Corrected' — past tense rather than the recommended imperative 'Correct' or 'Fix' — and the capitalized opening. Subject length is comfortable and no trailing period appears. With no body, the actual typo (in a shortcut name? a localization string?) is left to the diff; one line noting what was misspelled and where would help changelog readers judge relevance. No breaking-change or footer issues.