Broken dartdoc link generated from readme

[QuintinWillison]

See this warning from our Build Documentation workflow step:

Documenting ably_flutter...
Initialized dartdoc with 201 libraries in 69.7 seconds
Generating docs for library ably_flutter from package:ably_flutter/ably_flutter.dart...
Validating docs...
  warning: dartdoc generated a broken link to: DeveloperNotes.md, linked to from package-ably_flutter: file:///home/runner/work/ably-flutter/ably-flutter
Found 1 warning and 0 errors.
Documented 1 public library in 8.5 seconds
Success! Docs generated into /home/runner/work/ably-flutter/ably-flutter/doc/api

┆Issue is synchronized with this Jira Bug by Unito

[ikurek]

The issue doesn't seem to occur anymore, here's the Dartdoc output from latest builds:

Documenting ably_flutter...
Initialized dartdoc with 703 libraries
Generating docs for library ably_flutter from package:ably_flutter/ably_flutter.dart...
  warning: ably_flutter has no library level documentation comments
    from ably_flutter: (file:///home/runner/work/ably-flutter/ably-flutter/lib/ably_flutter.dart:1:9)
  warning: unresolved doc reference [ApplicationState]
    from ably_flutter.PushNotificationEvents.onNotificationTap: (file:///home/runner/work/ably-flutter/ably-flutter/lib/src/push_notifications/src/push_notification_events.dart:36:29)
Validating docs...
Found 8 warnings and 0 errors.
Documented 1 public library in 99.6 seconds
Success! Docs generated into /home/runner/work/ably-flutter/ably-flutter/doc/api

I've created a separate issue for the error that's still present in build log: #335