Improve java doc about VehicleArea*

Add Java doc for VehicleAreaSeat about how to use it with new API.
Clean up some doc for VehicleAreaType because it mentioned some
system API which may not be used in public API doc.

Bug: 147841088
Test: make and flash
Change-Id: Icc4919c6049dd92158ad64680286aef302575dbc
2 files changed
tree: 95f25a32c55c26f9a4b3a24a4c47f49f75762515
  1. car-bugreportd/
  2. car-default-input-service/
  3. car-lib/
  4. car-maps-placeholder/
  5. car-systemtest-lib/
  6. car-test-lib/
  7. car-usb-handler/
  8. car_product/
  9. computepipe/
  10. EncryptionRunner/
  11. evs/
  12. experimental/
  13. FrameworkPackageStubs/
  14. obd2-lib/
  15. procfs-inspector/
  16. service/
  17. surround_view/
  18. tests/
  19. tools/
  20. user/
  21. vehicle-hal-support-lib/
  22. watchdog/
  23. .clang-format
  24. .gitignore
  25. Android.mk
  26. CleanSpec.mk
  27. CPPLINT.cfg
  28. OWNERS
  29. PREUPLOAD.cfg
  30. README.md
README.md

Native (C++) code format is required to be compatible with .clang-format file. Run

git clang-format --style=file --extension='h,cpp,cc' HEAD~

Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.