Update index

free-programming-books.md

@@ -4,11 +4,11 @@
 * [Language Agnostic](#language-agnostic)
 * [Android](#android)
 * [Autotools](#autotools)
-* [ASP.NET MVC](#aspnet mvc)
+* [ASP.NET MVC](#aspnet-mvc)
 * [Assembly Language](#assembly-language)
 * [Bash](#bash)
 * [C / C++](#c-c)
-* [Clojure](#Clojure)
+* [Clojure](#clojure)
 * [CoffeeScript](#coffeescript)
 * [ColdFusion](#coldfusion)
 * [DB2](#db2)
@@ -17,7 +17,7 @@
 * [Emacs](#emacs)
 * [Erlang](#erlang)
 * [Flex](#flex)
-* [F#](#f)
+* [F#](#f-sharp)
 * [Forth](#forth)
 * [Git](#git)
 * [Go](#go)