Merge change 20222 into donut

* changes:
  Add support for preview SDK handling in doc templates.
tree: 82ddc7372dddc20ea750ba9d3b30b2fea4e4501b
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh