added missing H1 (#1192)

Author: mairaw

docs/csharp/tour-of-csharp/interfaces.md

@@ -12,7 +12,7 @@ ms.devlang: csharp
 ms.assetid: a9bf82f4-efd1-4216-bd34-4ef0fa48c968
 ---
 
-## Interfaces
+# Interfaces
 
 An ***interface*** defines a contract that can be implemented by classes and structs. An interface can contain methods, properties, events, and indexers. An interface does not provide implementations of the members it defines—it merely specifies the members that must be supplied by classes or structs that implement the interface.
 

docs/fsharp/tutorials/fsharp-interactive/index.md

@@ -11,7 +11,7 @@ ms.technology: devlang-fsharp
 ms.assetid: 36af8d1b-dc08-4a37-9497-d23c0a0ac11c 
 ---
 
-## Interactive Programming with F# #
+# Interactive Programming with F# #
 
 > [!NOTE]
 This article currently describes the experience for Windows only.  It will be rewritten.