doc: add Ubuntu 24.04 32-bit application support note

Mohammed Taqiuddinrequested to merge
mtaqiudd/amdgpu-install:ubuntu-32bit-support into master

Add instructions for manually installing 32-bit Mesa Vulkan drivers on Ubuntu 24.04, which does not enable i386 repositories by default.

This is needed for users running 32-bit applications such as Steam.

Edited by Jeremy Newton

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