Backtick formatting update (dotnet#5345)

Author: kendaleiv

xml/System.Net.Http/HttpClient.xml

@@ -117,7 +117,7 @@ Starting with .NET Core 2.1, the <xref:System.Net.Http.SocketsHttpHandler?displa
 - The elimination of platform dependencies, which simplifies deployment and servicing. For example, `libcurl` is no longer a dependency on .NET Core for macOS and .NET Core for Linux.
 - Consistent behavior across all .NET platforms.
 
-If this change is undesirable, on Windows you can still use <xref:System.Net.Http.WinHttpHandler> by referencing it's [NuGet package](https://www.nuget.org/packages/System.Net.Http.WinHttpHandler/) and passing it to [`HttpClient`'s constructor`](xref:System.Net.Http.HttpClient.%23ctor(System.Net.Http.HttpMessageHandler)) manually.
+If this change is undesirable, on Windows you can still use <xref:System.Net.Http.WinHttpHandler> by referencing it's [NuGet package](https://www.nuget.org/packages/System.Net.Http.WinHttpHandler/) and passing it to [`HttpClient`'s constructor](xref:System.Net.Http.HttpClient.%23ctor(System.Net.Http.HttpMessageHandler)) manually.
 
 ### Configure behavior using run-time configuration options