Docs: amdgpu-pro-vulkan on Gentoo. (bevyengine#6749)

When running Bevy on Gentoo using an AMD Radeon GPU, it panics unless `amdgpu-pro-vulkan` has been installed (and it took quite a bit of experimentation to find this information). This PR adds a mention of this to the linux dependencies documentation.
robtfm · Nov 28, 2022 · 7963bb9 · 7963bb9
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diff --git a/docs/linux_dependencies.md b/docs/linux_dependencies.md
@@ -137,6 +137,8 @@ Note that this template does not add Rust to the environment because there are m
    sudo emerge --ask libX11 pkgconf alsa-lib
 ```
 
+When using an AMD Radeon GPU, you may also need to emerge `amdgpu-pro-vulkan` to get Bevy to find the GPU.
+
 ## [Clear Linux OS](https://clearlinux.org/)
 
 ```bash