[@types/mermaid] Fix typo. Closes #37829 (#38902)
[@types/mermaid] Fix typo. Closes #37829 (#38902)


georgemarshall/DefinitelyTyped,mcliment/DefinitelyTyped,dsebastien/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped