[video_player] Polish issues #44405
Description
- Missing DartDocs:
- DurationRange: video_player.dart:17:1
- startFraction: video_player.dart:23:3
- endFraction: video_player.dart:27:3
- VideoFormat: video_player.dart:35:1
- initialized: video_player.dart:90:3
- hasError: video_player.dart:91:3
- aspectRatio: video_player.dart:92:3
- copyWith: video_player.dart:94:3
- DataSourceType: video_player.dart:133:1
- textureId: video_player.dart:194:3
- initialize: video_player.dart:197:3
- dispose: video_player.dart:289:3
- play: video_player.dart:308:3
- setLooping: video_player.dart:313:3
- pause: video_player.dart:318:3
- seekTo: video_player.dart:387:3
- createState: video_player.dart:458:3
- VideoProgressColors: video_player.dart:506:1
- createState: video_player.dart:599:3
- Needs more test coverage.
- example/README should be deleted.