Merge change 22524 into donut

* changes:
  docs only. fix api level highlighting for the treeview navigation.
tree: ecb6f23304b6a2d2df0bf0604e812eb210e23c39
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh