Change ms.topic from 'article' to 'concept-article' (#51833)

Author: adegeo

docfx.json

@@ -138,7 +138,7 @@
             "ms.author": "dotnetcontent",
             "ms.devlang": "dotnet",
             "ms.service": "dotnet",
-            "ms.topic": "article",
+            "ms.topic": "concept-article",
             "searchScope": [
                 ".NET"
             ],
@@ -258,7 +258,7 @@
                 "docs/csharp/language-reference/compiler-messages/*.md": "error-reference",
                 "docs/csharp/linq/*.md": "how-to",
                 "docs/csharp/misc/*.md": "error-reference",
-                "docs/csharp/programming-guide/**": "article",
+                "docs/csharp/programming-guide/**": "concept-article",
                 "docs/csharp/roslyn-sdk/get-started/*.md": "tutorial",
                 "docs/csharp/roslyn-sdk/tutorials/*.md": "tutorial",
                 "docs/csharp/tour-of-csharp/*.md": "overview",