docs(extension): Fix comments for ActivateComparator and WrapperCompa…

[lokidundun]

…rator

What is the purpose of the change?

优化 ActivateComparator 和 WrapperComparator 的类注释：

1. 修正 WrapperComparator 原注释中错误的类名引用（比如旧注释可能误导为 OrderComparator）。
2. 补充清晰的功能说明，让其他开发者更容易理解这两个比较器的作用。
3. 保持代码文档与实际逻辑一致，提升 Dubbo 项目的可读性和可维护性。

Checklist

• Make sure there is a GitHub_issue field for the change.
  本次修改是代码注释的优化，属于文档级小改进，未关联特定 Issue。
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
  本次修改仅涉及注释优化，无逻辑变更，因此无需单元测试。
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.02%. Comparing base (c831fef) to head (a1e757b).
⚠️ Report is 254 commits behind head on 3.3.

Additional details and impacted files

@@            Coverage Diff            @@
##                3.3   #15649   +/-   ##
=========================================
  Coverage     61.01%   61.02%           
- Complexity    11704    11720   +16     
=========================================
  Files          1910     1910           
  Lines         86806    86806           
  Branches      13100    13100           
=========================================
+ Hits          52968    52971    +3     
+ Misses        28419    28418    -1     
+ Partials       5419     5417    -2     

Flag	Coverage Δ
integration-tests-java21	33.00% <ø> (-0.01%)	⬇️
integration-tests-java8	33.14% <ø> (+0.01%)	⬆️
samples-tests-java21	32.68% <ø> (-0.01%)	⬇️
samples-tests-java8	30.44% <ø> (+0.02%)	⬆️
unit-tests-java11	59.01% <ø> (+<0.01%)	⬆️
unit-tests-java17	58.72% <ø> (-0.01%)	⬇️
unit-tests-java21	58.70% <ø> (-0.02%)	⬇️
unit-tests-java8	59.01% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[zrlw]

1. all the content should be provided in English.
2. any pr should be meaningful.