Renamed header to blog posts

The posted links are not official and refers individual blog articles explaining different aspects of Configuration sub-system. More appropriate header to refer this links would be `Blog posts` so that it does not sound too official. (Suggested: @Elion)

README.md

@@ -5,7 +5,7 @@ Configuration is a framework for accessing Key/Value based configuration setting
 
 This project is part of ASP.NET 5. You can find samples, documentation and getting started instructions for ASP.NET 5 at the [Home](https://github.com/aspnet/home) repo.
 
-## Docs and samples
+## Blog posts
 
 * [ASP.NET 5 Moving Parts: IConfiguration](http://whereslou.com/2014/05/23/asp-net-vnext-moving-parts-iconfiguration/)
 * [ASP.NET 5 Configuration - Microsoft.Framework.ConfigurationModel](http://blog.jsinh.in/asp-net-5-configuration-microsoft-framework-configurationmodel/)