Small fixes in docs.

docs/howto/how-to-cross-build-runtime-for-arm.md

@@ -25,7 +25,7 @@ RootFS will be prepared at `tools/cross/rootfs/arm` or `tools/cross/rootfs/aarch
 
 ***\* CAUTION: The OS version of rootfs must match the OS version of execution target device. On the other hand, you need to match the Ubuntu version of the development PC with the Ubuntu version of rootfs to be used for cross-build. Otherwise, unexpected build errors may occur.***
 
-If you are using Ubuntu 20.04 LTS, select `focal`, if you are using Ubuntu 22.04 LTS, select `jammy`. You can check your Ubuntu code name in the following way.
+If you are using Ubuntu 20.04 LTS, select `focal`, if you are using Ubuntu 22.04 LTS, select `jammy`, for Ubuntu 24.04 LTS, select `noble`. You can check your Ubuntu code name in the following way.
 
 ```
 $ cat /etc/lsb-release
@@ -81,7 +81,7 @@ If you select specific version, update symbolic link for build toolchain.
 Otherwise, you should set your custom cmake crossbuild toolchain. You can find cmake toolchain files in `infra/nnfw/cmake/buildtool/cross/`.
 
 ```
-$ update-alternatives --install /usr/bin/arm-linux-gnueabihf-gcc arm-linux-gnueabihf-gcc /usr/bin/arm-linux-gnueabihf-gcc-10 80 \
+$ sudo update-alternatives --install /usr/bin/arm-linux-gnueabihf-gcc arm-linux-gnueabihf-gcc /usr/bin/arm-linux-gnueabihf-gcc-10 80 \
     --slave /usr/bin/arm-linux-gnueabihf-g++ arm-linux-gnueabihf-g++ /usr/bin/arm-linux-gnueabihf-g++-10 \
     --slave /usr/bin/arm-linux-gnueabihf-gcov arm-linux-gnueabihf-gcov /usr/bin/arm-linux-gnueabihf-gcov-10
 ```