Delete extraneous comment

This should have been deleted previously as it pertains to an example
application rather than ours.

Author: glyn

Diff for: .github/workflows/quickstart.yml

@@ -1,8 +1,4 @@
 # Based on https://github.com/actions-rs/meta/blob/master/recipes/quickstart.md
-#
-# While our "example" application has the platform-specific code,
-# for simplicity we are compiling and testing everything on the Ubuntu environment only.
-# For multi-OS testing see the `cross.yml` workflow.
 
 on: [push, pull_request]