Commented Issue: Make the description better in the WCF self-host package [1267]

Users could get confused with 2 packages: "Microsoft ASP.NET Web API Owin Self Host" and "Microsoft ASP.NET Web API Self Host"?.

When should I pick which one package vs another.

We should add better description for WCF self host package to point out that it is now legacy
Comments: Please update the description of the Web API Self Host package to have the following text: This is a legacy package for hosting ASP.NET Web API within your own process (outside of IIS). Please use the Microsoft.AspNet.WebApi.OwinSelfHost package for new projects.