Merge change 20232 into donut

* changes:
  Fix broken url in offline preview docs
tree: 70a6b80981519d153a98031b6f2482e187778543
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh