Tests

Improve docs for LogInterceptor #651

Job	Run time
Check formatting (dio)	14s
Check formatting (example)	10s
Check formatting (example_flutter_app)	14s
Check formatting (plugins/cookie_manager)	11s
Check formatting (plugins/http2_adapter)	11s
Check formatting (plugins/native_dio_adapter)	11s
Analyze Dart-only libraries (dio)	20s
Analyze Flutter libraries (example_flutter_app)	33s
Analyze Flutter libraries (plugins/native_dio_adapter)	37s
Analyze Dart-only libraries (example)	17s
Analyze Dart-only libraries (plugins/cookie_manager)	16s
Analyze Dart-only libraries (plugins/http2_adapter)	19s
Run unit tests with Flutter plugins	0s
Run unit tests with plugins	0s
Run unit tests with dio	0s
	3m 33s

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