linuxdeploy is also available on ARM

https://docs.appimage.org/packaging-guide/from-source/native-binaries.html#bundling-resources-into-the-appdir currently says "At the moment, AppImages are provided for x86/i386 and x86_64/amd64 architectures, as other platforms cannot be targeted properly on the build service. The tool itself should support all major platforms, including ARM. You can compile linuxdeploy yourself to test it. Contributions adding new platforms welcome!".

However looking at the current [linuxdeploy releases](https://github.com/linuxdeploy/linuxdeploy/releases/), armhf and aarch64 downloads **are** also available :slightly_smiling_face: So the documentation needs a small update.