fix: snippet language

Author: baywet

concepts/sdks/national-clouds.md

@@ -66,6 +66,6 @@ Connect-MgGraph -Environment USGov -ClientId 'YOUR_CLIENT_ID' `
 
 ### [TypeScript](#tab/typescript)
 
-:::code language="csharp" source="./snippets/typescript/src/snippets/nationalClouds.ts" id="NationalCloudSnippet":::
+:::code language="typescript" source="./snippets/typescript/src/snippets/nationalClouds.ts" id="NationalCloudSnippet":::
 
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