143dc05381
Add library-level docs duplicating the discontinue message Related to https://github.com/dart-lang/sdk/issues/59716 Change-Id: Ib414a56c4412db0d9701c3d11f75354295775f9b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/408642 Commit-Queue: Srujan Gaddam <srujzs@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com> Auto-Submit: Kevin Moore <kevmoo@google.com>