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. .clang-format
  2. .gitattributes
  3. .gitconfig
  4. .github/
  5. .gitignore
  6. .gn
  7. .mailmap
  8. .packages
  9. AUTHORS
  10. BUILD.gn
  11. CHANGELOG.md
  12. CONTRIBUTING.md
  13. DEPS
  14. LICENSE
  15. PATENTS
  16. PRESUBMIT.py
  17. README.dart-sdk
  18. README.md
  19. WATCHLISTS
  20. build/
  21. client/
  22. codereview.settings
  23. dartdoc_options.yaml
  24. docs/
  25. pkg/
  26. runtime/
  27. samples-dev/
  28. samples/
  29. sdk/
  30. tests/
  31. third_party/
  32. tools/
  33. utils/
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