dfe24f786e
No functional chages. * Move doc comment-specific data classes out of ast.dart into their own library. * Make many fields and methods in DocCommentBuilder private, and re-sort. * Remove a text nit from doc comment warnings. Change-Id: I2459115c2d688ef7ba4a0fa7d3ff986ace9d3f1e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/324565 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Auto-Submit: Samuel Rawlins <srawlins@google.com>