Docs backlog batch: KOB-35866, KOB-36220, KOB-40035, KOB-40521

[tiffany-kobiton]

Summary

Consolidates four small docs-backlog tickets into a single PR for combined review. Each ticket is preserved as its own commit.

• KOB-35866 — Add Kobiton API recommendation for app uploads on the virtualUSB start-debugging page.
• KOB-36220 — Add iOS Safari Advanced settings note to the Inspector WebView section.
• KOB-40035 — Remove iPad 5th generation (2017) from the supported mobile devices list.
• KOB-40521 — Add is:virtual search param to the custom search queries reference.

Supersedes #475, #476, #477, #478.

Test plan

• Build the Antora site and confirm each updated page renders.
• Verify xrefs in the vU note resolve (KOB-35866).
• Confirm the Apple iPad row-span on the supported-devices table reads .27+ after the removal (KOB-40035).