Update docs/standard/base-types/substitutions-in-regular-expressions.md

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

Author: nathlaroche

docs/standard/base-types/substitutions-in-regular-expressions.md

@@ -1,7 +1,7 @@
 ---
 title: "Substitutions in Regular Expressions"
 description: Make substitutions to replace matched text using regular expressions in .NET. Substitutions are language elements recognized only within replacement patterns.
-ms.topic: concept-article
+ms.topic: article
 ms.date: "03/30/2017"
 dev_langs: 
   - "csharp"