Remove duplicate word

Author: DAXaholic

docs/framework/whats-new/index.md

@@ -120,7 +120,7 @@ Starting with the .NET Framework 4.7, WCF allows you to configure TSL 1.1 or TLS
 
 **Improved reliability of WCF applications and WCF serialization**
 
-WCF includes a number of code changes that eliminate race conditions, thereby improving improving performance and the reliability of serialization options. These include:
+WCF includes a number of code changes that eliminate race conditions, thereby improving performance and the reliability of serialization options. These include:
 
 - Better support for mixing asynchronous and synchronous code in calls to **SocketConnection.BeginRead** and **SocketConnection.Read**.
 - Improved reliability when aborting a connection with **SharedConnectionListener** and **DuplexChannelBinder**.
@@ -1419,4 +1419,4 @@ For more information on the <xref:System.TimeZoneInfo> structure and time zone a
  [The .NET Framework and Out-of-Band Releases](../../../docs/framework/get-started/the-net-framework-and-out-of-band-releases.md)   
  [What's New in Visual Studio 2017](/visualstudio/ide/whats-new-in-visual-studio)   
  [ASP.NET](/aspnet)   
- [What’s New in Visual C++](/cpp/what-s-new-for-visual-cpp-in-visual-studio) 
+ [What’s New in Visual C++](/cpp/what-s-new-for-visual-cpp-in-visual-studio)