Add XML documentation for Javax.Net.Ssl

The `Javax.Net.Ssl` namespace contains **160** `To be added` placeholders in source XML documentation (excluding `docs\xml\index.xml`).

```powershell
rg -n -i --glob 'Javax.Net.Ssl/**' --glob 'ns-Javax.Net.Ssl.xml' 'to be added' docs\xml
```

## Update log

- 2026-09-10: Refreshed the placeholder scan from **180** to **160** (reduced by **20**). Related documentation PRs: [#377](https://github.com/dotnet/android-api-docs/pull/377), [#409](https://github.com/dotnet/android-api-docs/pull/409), [#574](https://github.com/dotnet/android-api-docs/pull/574), [#644](https://github.com/dotnet/android-api-docs/pull/644).

Start by running the provided rg command against docs\xml, then inspect the files under Javax.Net.Ssl/** and ns-Javax.Net.Ssl.xml containing the 160 placeholders. Replace the placeholders with accurate XML documentation and rerun the scan to confirm that the targeted entries are covered.

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