[sdk] Update the canonical URL for generated API docs

Add a TODO to remove outdated options when they are available on stable.

Bug: b/323126451
Change-Id: I2977c12fc07c50861bb675698fbba78d359e53ec
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/355100
Auto-Submit: Alexander Thomas <athom@google.com>
Reviewed-by: Jonas Termansen <sortie@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
3 files changed