Update workflow to write to README.md instead of POLICIES.md

Changed the output file in the update-md GitHub Actions workflow from POLICIES.md to README.md to ensure generated content is saved to the correct documentation file.

Author: aaronparker

.github/workflows/update-md.yml

@@ -40,7 +40,7 @@ jobs:
                                 }
                             }
                         } | New-MDTable -Shrink
-                        $Content | Set-Content -Path "$($SubDir.FullName)/POLICIES.md"
+                        $Content | Set-Content -Path "$($SubDir.FullName)/README.md"
                     }
                 }