Fix issues in responsive-design.md

Correct missing 'ms.' prefix on localizationpriority metadata field.
All other files in hub/apps/design/layout/ use 'ms.localizationpriority',
but responsive-design.md was using bare 'localizationpriority', causing
the publishing system to ignore the localization priority setting.

Co-authored-by: Copilot <[email protected]>

Author: GrantMeStrength

hub/apps/design/layout/responsive-design.md

@@ -6,7 +6,7 @@ op-migration-status: ready
 ms.date: 09/25/2024
 ms.topic: article
 keywords: windows 10, uwp
-localizationpriority: medium
+ms.localizationpriority: medium
 ms.custom: RS5
 ---
 # Responsive design techniques