Merge change 22348 into donut

* changes:
  docs only. remove preliminary watermak
tree: ce8d63facef2d1e4c7d8514c14f8ebe1cc01fe7f
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh