docs: contacts async_trait / boxed-future fix (whatsapp-rust#826)

[jlucaso1]

Summary\n\nDocumentation update for oxidezap/whatsapp-rust#826, which fixed is_on_whatsapp() and get_user_info() failing to compile for consumers that box their futures (the pattern #[async_trait] uses).\n\n- New changelog/2026-06-10-hrtb-closures.mdx — explains the root cause (HRTB-violating closures inside the library's future types), the fix (named fn items), and the regression guard added in the same PR\n- Updated api/contacts.mdx — adds an "Async compatibility" section noting both affected methods now work correctly in #[async_trait] and Box<dyn Future> contexts, with a link to the fix\n- Updated docs.json — registers the new changelog page in the navigation\n\n## Test plan\n\n- [ ] Verify the new changelog page renders in the Changelog tab\n- [ ] Verify the "Async compatibility" section appears in the Contacts API page between "Privacy & TC tokens" and "Error handling"\n- [ ] Confirm no existing content was changed beyond the new section insertion

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• api/contacts.mdx
• changelog/2026-06-10-hrtb-closures.mdx
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