[office-js-preview] Fix typo and run-on sentence (#49634)
[office-js-preview] Fix typo and run-on sentence (#49634)

* Fix typo and run-on sentence

* Fix typo
georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped