Add XML documentation for Java.Time.Temporal #267

The Java.Time.Temporal namespace contains 139 To be added placeholders in source XML documentation (excluding docs\xml\index.xml).

Finishability

Finishability: not assessed. The TODO count does not establish whether official Android/Java reference comments exist for every remaining member. A source-coverage pass is still needed; if the official comments are exhausted, use a separately agreed completion approach (for example, reviewed authored documentation based on an authoritative source) rather than another importer pass.

rg -n -i --glob 'Java.Time.Temporal/**' --glob 'ns-Java.Time.Temporal.xml' 'to be added' docs\xml

Update log

• 2026-10-02: Placeholder count refreshed from 237 to 139 (decreased by 98).
• 2026-09-10: Refreshed the placeholder scan from 254 to 237 (reduced by 17). Related documentation PRs: #443, #484, #498, #644.