Call out addError API in stderr docs

Closes #32808

One could reasonably think that `addError` is a useful API on `stderr`,
but in this case it will only cause an unhandled async error and exit
the VM.

Change-Id: Ia9e14ab53faec19aed91a1a5acc0709807204de8
Reviewed-on: https://dart-review.googlesource.com/71921
Reviewed-by: Zach Anderson <zra@google.com>
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
Commit-Queue: Nate Bosch <nbosch@google.com>
1 file changed
tree: a969a6dc4323c6e543ab6c1980bad6a495d99bd0
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. dartdoc_options.yaml
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

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