Specified categories were disapperared from the API doc

[AlexV525]

The request cfug/dio#2344 is trying to remove the categories doc annotation, but then the topics disappeared.

However, the doc of the package pxl.dart seems working well while we have a similar configuration.

[srawlins]

Please elaborate on what problem you are seeing. What did you try to do? What was the expected result? What was the actual result?

[AlexV525]

https://pub.dev/documentation/dio/latest/dio/

There are two topics in the doc. The pull request is about removing the category annotation: https://github.com/cfug/dio/blob/b16a611a14b8b8a4cb7f2556628a5f030c315ffd/dio/lib/dio.dart#L4-L5

After removed, those topics are disappeared from the doc: cfug/dio#2344 (comment)

We have configured categories in the yaml: https://github.com/cfug/dio/blob/main/dio/dartdoc_options.yaml

I looked at the package pxl.dart and it doesn't seem to have extra configuration but topics are displayed correctly in its doc.