[docs][utest]:Add standardized utest documentation block for slab_tc

[CYFS3]

Relates to #10895

拉取/合并请求描述：(PR description)

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为什么提交这份PR (why to submit this PR)

你的解决方案是什么 (what is your solution)

请提供验证的bsp和config (provide the config and bsp)

• BSP:

• .config:

• action:

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• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
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代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
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• 代码是高质量的 Code in this PR is of high quality
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[github-actions]

👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

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🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page
   点击进入工作流 → | Click to open workflow →

2. 点击 Run workflow | Click Run workflow

• 设置需排除的文件/目录（目录请以"/"结尾）
  Set files/directories to exclude (directories should end with "/")
• 将目标分支设置为 \ Set the target branch to：slab_utest
• 设置PR number为 \ Set the PR number to：10932

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如有问题欢迎联系我们，再次感谢您的贡献！💐
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[github-actions]

📌 Code Review Assignment

🏷️ Tag: kernel

Reviewers: @GorrayLi @ReviewSun @hamburger-os @lianux-mm @wdfk-prog @xu18838022837

Changed Files (Click to expand)

• src/utest/slab_tc.c

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📊 Current Review Status (Last Updated: 2025-11-13 16:23 CST)

• ⌛ @GorrayLi Pending Review
• ⌛ @ReviewSun Pending Review
• ⌛ @hamburger-os Pending Review
• ⌛ @lianux-mm Pending Review
• ⌛ @wdfk-prog Pending Review
• ⌛ @xu18838022837 Pending Review

---

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3. PR合并前需至少一位维护者确认
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[Copilot]

Pull Request Overview

This PR adds comprehensive documentation to the slab memory allocator unit test file (slab_tc.c). The documentation provides a standardized block that explains the test case objectives, scenarios, verification metrics, dependencies, and expected results.

• Adds a detailed documentation block describing two test scenarios: random allocation stress test and random reallocation stress test
• Documents the core APIs being tested: rt_slab_init, rt_slab_alloc, rt_slab_free, rt_slab_realloc, rt_slab_detach
• Includes verification metrics and expected results to help developers understand the test behavior