These docs are missing information:
1. On what the `achievements` property is. Clearly a collection of entities, but the entity objects are completely undocumented.
2. On what the `visibility` property represents and the possible values for it.
3. On what the `hazardous`, `elevation_profile`, and `starred` properties of the `segment` property represent. It's supposed to be documented by https://developers.strava.com/docs/reference/#api-models-SummarySegment but these properties are omitted in the docs.