Fixing typo in comment
Fixing typo in comment

Change-Id: I3a64ee58f2d3d5c23492c799a8cf50876fe8b4a1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/246987
Reviewed-by: Elliott Brooks <540111ccd85640c35000515040d11fd5120751a5@google.com>
Reviewed-by: Carolyn Qu <896438511529982f4debfdc2794bd7ff3b38e79d@google.com>
Commit-Queue: Islina Shan <dd51a02e1ae05c292e3f91f0a6805a5a16b1ec82@google.com>
Reviewed-by: Bob Nystrom <afede3a9ebedb865bee78398feff6fbe97068f17@google.com>
Reviewed-by: Islina Shan <dd51a02e1ae05c292e3f91f0a6805a5a16b1ec82@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk