Fix comments in workflow yml

.github/workflows/ci-validate-pins.yml

@@ -32,12 +32,8 @@ on:
     - '**/*.md'
 
 jobs:
-  # This runs all unit tests as a single job. While it should be possible to break this up into
-  # multiple jobs, they currently run quickly and finish long before the compilation tests.
   validate_pins_files:
     name: Validate Pins Files
-    # These tests will only be able to run on the bugfix-2.1.x branch, until the next release
-    # pulls them into additional branches.
     if: github.repository == 'MarlinFirmware/Marlin'
 
     runs-on: ubuntu-latest