Merge change 23037 into donut

* changes:
  Doc changes for SDK update. Update SDK toc template.
tree: 82ba590a278e1556028856dbce21f2f9aca107b9
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh