docs: fixed a typo in documentation (#695)
docs: fixed a typo in documentation (#695)

* fixed a typo in documentation

* Fix typos in the documentation

* Revert "fixed a typo in documentation"

This reverts commit 5a70fc9a4c8b0f3fdc74305bbcf183ae69e3183f.

angular/zone.js,angular/zone.js,angular/zone.js,angular/zone.js,angular/zone.js