[#453] Document how to make cross-compilation work with buildroot

doc/cross-compile/buildroot.md

@@ -1,39 +1,52 @@
 # How to make cross-compilation work with buildroot
 
-1. install the build dependencies on your host PC, like: cmake, g++, clang...
-2. install the `rust` toolchain:
+1. Install the build dependencies on your host PC, like: cmake, g++, clang...
+
+2. Install the `rust` toolchain:
 
    ```console
    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
    ```
 
-3. add the arm64 target for Rust: `rustup target add aarch64-unknown-linux-gnu`
-4. modify the arm64 target name to suit your cross-compilation tool, need to
-   create this file `~/.cargo/config.toml`, add:
+3. Add the arm64 target for Rust:
+
+   ```console
+   rustup target add aarch64-unknown-linux-gnu
+   ```
+
+4. Modify the arm64 target name to suit your cross-compilation tool, need to
+   create this file `~/.cargo/config.toml`, add the below code,
+   "aarch64-buildroot-linux-GNU-gcc" which is your real cross-compilation tool
+   name:
    ```console
    [target.aarch64-unknown-linux-gnu]
    linker = "aarch64-buildroot-linux-gnu-gcc"
    ```
-   "aarch64-buildroot-linux-GNU-gcc" is your real cross-compilation tool name
-5. source your cross-compilation buildroot environment:
-   `source /to/your/environment-setup`, this file should be in your buildroot
-   folder
+5. Source your cross-compilation buildroot environment:
+
+   ```console
+   source /to/your/environment-setup
+   ```
+
+   The `environment-setup` file should be in your buildroot directory.
+
+6. Add the buildroot sysroot on host PC environment:
 
-6. add the buildroot sysroot on host PC environment:
    ```console
    export BINDGEN_EXTRA_CLANG_ARGS="--sysroot=/to/your/sysroot"
    ```
+
 7. Change to the iceoryx2 directory
 
    ```console
    cd iceoryx2
    ```
 
-8. cmake -S . -B build -DBUILD_EXAMPLES=ON -DCMAKE_INSTALL_PREFIX=../\_OUTPUT
-   -DRUST_TARGET_TRIPLET='aarch64-unknown-linux-GNU'
-
-9. make -j8
-
-10. make install
+8. Configure, build and install iceoryx2
+   ```console
+   cmake -S . -B build -DBUILD_EXAMPLES=ON -DCMAKE_INSTALL_PREFIX=../\_OUTPUT -DRUST_TARGET_TRIPLET='aarch64-unknown-linux-GNU'
+   cmake --build build
+   cmake --install build
+   ```
 
-Finally, you can get the arm64 libs, include files in the `_OUTPUT` folder.
+Finally, you can get the arm64 libs, include files in the `_OUTPUT` directory.