Unify two hint codes for documentation purposes
Unify two hint codes for documentation purposes

Change-Id: Ia6f4fe0537e9ef0aa377aa48b624cb357b3d7c1c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/192283
Reviewed-by: Konstantin Shcheglov <09e4d7516628963212bf4aace2f97603d2b706e4@google.com>
Reviewed-by: Samuel Rawlins <5cf2cac5eec2ad6d0eb2b0f4ff6af9a590ce2bf6@google.com>
Commit-Queue: Brian Wilkerson <1f7641b6b14c52b9163524ab8d9aabff80176f21@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