docs: complete uORB and KVDB API documentation coverage

[tanghao-xiaomi]

Overview

Bring uorb.md and kvdb.md to 100% coverage of their public headers, filling in the APIs that were previously missing from the earlier pass.

Coverage

Module	Header	Before	After
uORB	apps/system/uorb/uORB/uORB.h	32 / 48	48 / 48
KVDB	frameworks/system/utils/include/kvdb.h + cutils/properties.h	23 / 31	31 / 31

Main Changes

uorb.md

• Added 18 core APIs that were previously missing: orb_advertise, orb_advertise_multi, orb_advertise_queue, orb_advertise_multi_queue, orb_advertise_multi_queue_persist_info, orb_publish, orb_publish_auto, orb_subscribe, orb_subscribe_wakeup, orb_subscribe_multi_wakeup, orb_copy, orb_unlink, orb_absolute_time, orb_set_interval, orb_get_interval, orb_set_frequency, orb_get_frequency, plus minor entries.
• Fixed duplicate empty ## 发布接口 heading.
• Corrected ### orb_scanf title to ### orb_sscanf (the signature inside the code block was already orb_sscanf; only the heading was inconsistent).

kvdb.md

• Added property_list_binary (binary-value iteration).
• Split four composite sections so each public API has its own ### name entry, per api-doc-standards.md:
  • property_get_bool/int32/int64_with_err → 3 entries
  • property_set_bool/int32/int64 → 3 entries
  • property_set_bool/int32/int64_oneway → 3 entries
  • property_set_buffer / property_set_buffer_oneway → 2 entries

Quality

• Each new section includes a signature, a Chinese description, a **参数**: list, and a **返回值**: section.
• Every referenced function name has been verified against the source headers.
• Both files retain their existing openvela implementation notes and functional grouping.
• No Doxygen or Sphinx directives remain.

Placement Rationale

Both files stay in framework/ (not kernel/) because:

• uORB source lives in apps/system/uorb/, a userspace framework component, not nuttx/ kernel.
• KVDB source lives in frameworks/system/utils/, also userspace.
• This matches the rest of the framework-level API docs (bluetooth, media, telephony, feature, etc.) and the navigation in framework/index.md.

Statistics

2 files changed, +1156 / -262 lines.

[tanghao-xiaomi]

/check-cla

[github-actions]

✅ CLA Verification Complete

@tanghao-xiaomi All contributors have signed the CLA!

• zhangxiaowei16@xiaomi.com ✅

📋 View detailed check results: Action Run #25548324325

Your pull request can now proceed with the review process! 🎉