Update old reference of ASP.NET 5

Commit migrated from dotnet/corefx@7f19370

docs/libraries/project-docs/public-signing.md

@@ -9,7 +9,7 @@ Public signing is very similar to [delay signing](http://msdn.microsoft.com/en-u
 
 When running on the full .NET Framework we only support using public signed assemblies for debugging and testing purposes. Microsoft does not guarantee that you can successfully load public signed assemblies in all scenarios that are required for production use. For list of known scenarios where public signing does not work when running on .NET Framework, see below.
 
-However, in the context of ASP.NET 5 on .NET Core, or .NET Native, Microsoft supports using public signed assemblies for production uses. Make note, however, that while ability to load public signed binaries is supported on these platforms, the API and contents of the assembly itself is unsupported (due to it being privately built).
+However, in the context of .NET Core, or .NET Native, Microsoft supports using public signed assemblies for production uses. Make note, however, that while ability to load public signed binaries is supported on these platforms, the API and contents of the assembly itself is unsupported (due to it being privately built).
 
 Known issues when debugging and testing public signed assemblies on .NET Framework: