Update entity-framework-6.rst (dotnet#1687)

Hi,

I couldn't get this demo to work unless I added this underscore (source http://bleedingnedge.com/2015/11/01/entity-framework-6-with-asp-net-5/) otherwise I got the error "Cannot convert lambda expression to type 'Type' because it is not a delegate type"

I'm not sure whether this is supposed to happen?

Cheers,
Rob

Author: rphi

aspnet/data/entity-framework-6.rst

@@ -46,7 +46,7 @@ In the ``Startup`` class within ``ConfigureServices`` add factory method of your
     
     public void ConfigureServices(IServiceCollection services)
     {
-        services.AddScoped(() => new ApplicationDbContext(Configuration["Data:DefaultConnection:ConnectionString"]));
+        services.AddScoped((_) => new ApplicationDbContext(Configuration["Data:DefaultConnection:ConnectionString"]));
         
         // Configure remaining services
     }