docs: 获取公钥API文档 (closed #2303)

[Huayeaaa]

PR

CheckList（PR Assigners）

确认已完成以下操作：

• [x] 已将分支与当前合入分支同步
• [x] 已在关联 Issue 中补充「功能自测」部分内容
• [x] 已更新关联 Issue 的状态 backlog -> todo -> for test -> tested（需通过测试同学测试） -> done
• [x] 将 PR 添加上 pr/reviewable

CheckList（PR Reviewers）

确认已完成以下操作：

• [ ] 检查关联 Issue 「功能自测」部分内容
• [ ] 必要时打回 pr/reviewable，要求重新修改
• [ ] 及时 Approve

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (v2.4.7-dev@b00d9dd). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v2.4.7-dev #2304 +/- ## ============================================= Coverage ? 75.13% ============================================= Files ? 405 Lines ? 28948 Branches ? 0 ============================================= Hits ? 21750 Misses ? 7198 Partials ? 0 ```

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