Improve advice for finding Linux GPUs

Continuing https://github.com/bevyengine/bevy/issues/3191

I wasn't quite sure why the above issue was closed so I opened this. Computers with older hardware aren't going to disappear any time soon I think, so this error will probably continue to appear. (I just hit it today). The linked documentation in the error currently discusses build dependencies, not runtime dependencies, so I'm still not 100% sure why I'm getting the error (my hardware supports vulkan in some form, but it's not super new).

There's two specific ways this could be improved here:

1. If the problem is no hardware was found that supports vulkan, explicitly say this (instead of saying no GPU found)
2. Provide details on what was searched/rejected, like rejected visual X because no feature Y, etc

This is a "help people help themselves" thing.

(FWIW I don't think this is specific to Linux going by the error text, but I kept the title for familiarity)