[native_doc_dartifier] Fix CI

[marshelino-maged]

closes #2471
CI output marshelino-maged#11

Adding an example in the "translate prompt" on how to translate "implementing an interface"

Before this small edit, the tests passed only 6 out of 10 times.
After the edit, they now pass 10 out of 10 times.

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• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

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Package	Changed Files
package:native_doc_dartifier	pkgs/native_doc_dartifier/lib/src/prompts.dart

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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no missing headers

All source files should start with a license header.

Unrelated files missing license headers

Files
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/native_doc_dartifier/lib/native_doc_dartifier.dart
pkgs/native_doc_dartifier/lib/src/native_doc_dartifier_base.dart
pkgs/native_doc_dartifier/tool/compile_java.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

[HosseinYousefi]

Maybe also mention that to use this interface you'd need to do Comparable.implement(MyClass())