updated docs

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

en/device-dev/kernel/kernel-lite-mini.md

-# Kernel for Mini Systems<a name="EN-US_TOPIC_0000001124663064"></a>
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--   **[Kernel Overview](kernel-mini-overview.md)**  
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--   **[Basic Kernel](kernel-mini-basic.md)**  
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--   **[Extension Components](kernel-mini-extend.md)**  
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--   **[Kernel Debugging](kernel-memory-inner.md)**  
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--   **[Appendix](kernel-mini-app.md)**  
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en/device-dev/kernel/kernel-lite-small.md

-# Kernel for Small Systems<a name="EN-US_TOPIC_0000001171191693"></a>
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--   **[Kernel Overview](kernel-small-overview.md)**  
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--   **[Kernel Startup](kernel-small-start.md)**  
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--   **[Basic Kernel](kernel-small-basics.md)**  
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--   **[Extension Components](kernel-small-bundles.md)**  
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--   **[Debugging and Tools](kernel-small-debug.md)**  
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--   **[Appendix](kernel-small-apx.md)**  
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en/device-dev/kernel/kernel-lite.md

-# Kernel for Mini and Small Systems<a name="EN-US_TOPIC_0000001157479401"></a>
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--   **[Kernel for Mini Systems](kernel-lite-mini.md)**  
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--   **[Kernel for Small Systems](kernel-lite-small.md)**  
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