improve list of browsers supporting WebGPU

[mockersf]

          for a followup PR: this is no longer true, WebGPU also works on some mobile browsers, and on Safari TP, and Firefox Nightly

We should probably link to something like https://caniuse.com/webgpu for a list or https://browserleaks.com/webgpu so that user can test their browser instead of keeping a list ourselves

Originally posted by @mockersf in #1918 (comment)