Add XML documentation for Android.Database.Sqlite

The `Android.Database.Sqlite` namespace contains **237** `To be added` placeholders in source XML documentation (excluding `docs\xml\index.xml`).

Example command:

```powershell
rg -n -i --glob 'Android.Database.Sqlite/**' --glob 'ns-Android.Database.Sqlite.xml' 'to be added' docs\xml
```

## Update log

- 2026-09-10: Refreshed the placeholder scan from **231** to **237** (increased by **6**). Related documentation PRs: [#644](https://github.com/dotnet/android-api-docs/pull/644).

Run the provided rg command to enumerate the 237 placeholders under docs\xml for Android.Database.Sqlite, including ns-Android.Database.Sqlite.xml. Review each matching entry and replace the placeholder with accurate API documentation. Done means the namespace scan no longer reports these 'To be added' entries.

Escrito por el modelo de indexación a partir del texto del issue.