change EF Identity namespace (dotnet#1410)

Author: lambidu

aspnet/security/authentication/identity.rst

@@ -18,7 +18,7 @@ In this topic, you'll learn how to use ASP.NET Core Identity to add functionalit
 
   .. image:: identity/_static/01-mvc.png
 
-  The created project contains the ``Microsoft.AspNetCore.Identity.EntityFramework`` package, which will persist the identity data and schema to SQL Server using `Entity Framework Core`_.
+  The created project contains the ``Microsoft.AspNetCore.Identity.EntityFrameworkCore`` package, which will persist the identity data and schema to SQL Server using `Entity Framework Core`_.
 
   .. note:: In Visual Studio, you can view NuGet packages details by selecting **Tools** -> **NuGet Package Manager** -> **Manage NuGet Packages for Solution**. You also see a list of packages in the dependencies section of the *project.json* file within your project.