Update docfx.json

Co-authored-by: Bill Wagner <[email protected]>

Author: nathlaroche

docfx.json

@@ -275,7 +275,7 @@
                 "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/**": "concept-article",
+                "docs/csharp/programming-guide/**": "article",
                 "docs/csharp/roslyn-sdk/get-started/*.md": "tutorial",
                 "docs/csharp/roslyn-sdk/tutorials/*.md": "tutorial",
                 "docs/csharp/tour-of-csharp/*.md": "overview",