docs: fix TypeScript DefaultApi.md examples (positional calls, oneOf, date-time) (#190)

Channels: Current

### 📚 Docs

- docs: fix TypeScript DefaultApi.md example call style (positional)
(OneSignal/API-Client-Libraries#405)
- docs: align DefaultApi.md heading + params table with positional
examples (OneSignal/API-Client-Libraries#405)
- docs: [SDK-4817] render oneOf example as first variant in Python/TS
DefaultApi.md (OneSignal/API-Client-Libraries#412)
- docs: [SDK-4817] fix date-time example values in Python/TS
DefaultApi.md (OneSignal/API-Client-Libraries#411)

Author: sherwinski