Improve exclude reasons

Author: eregon

.github/workflows/test.yml

@@ -65,7 +65,6 @@ jobs:
         - { os: ubuntu-24.04-arm, ruby: '2.1' }
         - { os: ubuntu-24.04-arm, ruby: '2.2' }
         # RubyInstaller windows-arm64 builds only exist for Ruby 3.4+
-        - { os: windows-11-arm, ruby: '1.9' }
         - { os: windows-11-arm, ruby: '2.0' }
         - { os: windows-11-arm, ruby: '2.1' }
         - { os: windows-11-arm, ruby: '2.2' }
@@ -81,10 +80,12 @@ jobs:
         # https://github.com/ruby/jruby-dev-builder/pull/14#issuecomment-2829841247
         - { os: windows-11-arm, ruby: jruby }
         - { os: windows-11-arm, ruby: jruby-head }
-        # Windows (note: previews are not available on Windows)
+        # RubyInstaller has no 64-bit builds of 1.9 on Windows
         - { os: windows-2019, ruby: '1.9' }
         - { os: windows-2022, ruby: '1.9' }
         - { os: windows-2025, ruby: '1.9' }
+        - { os: windows-11-arm, ruby: '1.9' }
+        # TruffleRuby does not support Windows
         - { os: windows-2019, ruby: truffleruby }
         - { os: windows-2022, ruby: truffleruby }
         - { os: windows-2025, ruby: truffleruby }