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.

Written by the indexing model from the issue text.