docs: build: update build kernel

Signed-off-by: Han Gao <rabenda.cn@gmail.com>

Author: RevySR

docs/build/other/build_kernel.md

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+# 编译内核
+
+支持架构：`x86_64` `riscv64`
+
+`x86_64` 支持工具链：
+* `3.2.0` Xuantie-900 Linux 6.6.0 版本v3.2.0
+* `14` 主线 RISC-V GCC 14交叉编译器（默认）
+
+`riscv64` 支持工具链：
+* `rv` 主线 GCC 编译器
+
+通过`TOOLCHAIN_VERSION`变量选择要使用的编译器
+
+## 使用方法
+
+```bash
+git clone https://github.com/revyos/xuantie-kernel-docker
+cd xuantie-kernel-docker
+docker build --build-arg TOOLCHAIN_VERSION=14 -t xuantie900:linux14 . # 根据支持架构确定 TOOLCHAIN_VERSION 参数
+docker run -it --rm -v LOCAL_PATH:/output xuantie900:linux14 bash # LOCAL_PATH 为编译好的内核存放目录
+./mkkernel_x64.sh # 根据 TOOLCHAIN_VERSION 配置选择 mkkernel_xuantie.sh 或 mkkernel_riscv64.sh
+```
+
+整个过程执行完成后，构建好的内核deb包将会被拷贝到`LOCAL_PATH`指定的目录中，然后使用`dpkg`安装即可。
+
+```bash
+sudo dpkg -i [PACKAGE]
+```
+
+编译过程会产生多个结果：
+* linux-headers.deb(需要编译内核模块或内核开发时安装)
+* linux-image-dbg.deb(调试符号，需要调试内核时安装)
+* linux-image.deb(内核，必装)
+* linux-libc-dev.deb(libc接口，一般不安装，使用通用版即可)
+
+## 注意事项
+
+1. 如需更改编译的版本，可在进入docker环境（输入`bash`）后自由修改
+2. `x86_64`环境下交叉编译出的`linux-header`包可能包含`x86_64`的头文件。如需进行内核开发或使用如`zfs`之类的DKMS模块，请在RISC-V环境下使用`TOOLCHAIN_VERSION=rv`编译。

docs/build/other/manuel_build_kernel.md

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+# Build Kernel
+
+Supported Architectures: `x86_64` `riscv64`
+
+`x86_64` Supported Toolchains:
+* `3.2.0` Xuantie-900 Linux 6.6.0 v3.2.0
+* `14` Mainline RISC-V GCC 14 Cross Compiler (default)
+
+`riscv64` Supported Toolchains:
+* `rv` Mainline GCC Compiler
+
+Select the compiler to use via the `TOOLCHAIN_VERSION` variable
+
+## Usage
+
+```bash
+git clone https://github.com/revyos/xuantie-kernel-docker
+cd xuantie-kernel-docker
+docker build --build-arg TOOLCHAIN_VERSION=14 -t xuantie900:linux14 .
+docker run -it --rm -v LOCAL_PATH:/output xuantie900:linux14 bash
+./mkkernel_x64.sh # use mkkernel_xuantie.sh or mkkernel_riscv64.sh depend on your TOOLCHAIN_VERSION
+```
+
+The built kernel deb packages will be copied to the directory specified by `LOCAL_PATH`, and then you can install them using `dpkg`.
+
+The compilation process will produce several results:
+* linux-headers.deb (Install when compiling kernel modules or for kernel development)
+* linux-image-dbg.deb (Debug symbols, install when debugging the kernel)
+* linux-image.deb (Kernel, must install)
+* linux-libc-dev.deb (libc interface, generally not installed, use the generic version)
+
+## Notes
+
+1. To change the version to be compiled, you can freely modify it after entering the docker environment (input `bash`)
+2. The `linux-header` package cross-compiled in the `x86_64` environment may contain `x86_64` header files. If you need to develop the kernel or use DKMS modules such as `zfs`, please compile with `TOOLCHAIN_VERSION=rv` in the RISC-V environment.