Fixed the anchor link in the index

free-podcasts-screencasts-en.md

@@ -2,7 +2,7 @@
 
 * [Android](#android)
 * [Angular JS](#angularjs)
-* [C#](#csharp)
+* [C#](#c)
 * [C++](#c-1)
 * [CSS](#css)
 * [Elixir](#elixir)