syncbase: improve comments about concurrency

- Updates client-facing model.go's to mention what happens
  with Scan/Exec and concurrent writes
- Updates storage engine model.go to document concurrency
  semantics
- Other misc related comment tweaks

Change-Id: Iad5f50334ae942ffab06170caf5ec8c9c4b270bf
4 files changed
tree: 07733e22e159cef189f5a63c1ecd9589dab33288
  1. v23/
  2. x/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. VERSION