[go_router] Fix @tool directive with missing @end-tool (#4998)

Fixes
https://logs.chromium.org/logs/dart/buildbucket/cr-buildbucket/8768923225300611905/+/u/Run_flutter_plugins_tests/stdout

Each `{@tool}` tag must also have an `{@end-tool}` tag.

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3 files changed
tree: e78d0959b0e5ed3b463cc33df2580c2533407524
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .clang-format
  8. .gitattributes
  9. .gitignore
  10. .metadata
  11. analysis_options.yaml
  12. AUTHORS
  13. CODEOWNERS
  14. CONTRIBUTING.md
  15. customer_testing.bat
  16. customer_testing.sh
  17. LICENSE
  18. README.md
README.md

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