Standize C++ Headings (#5275)

courses/free-courses-it.md

@@ -5,7 +5,7 @@
 * [Assembly](#assembly)
 * [C](#c)
 * [C Sharp](#c-sharp)
-* [C++](#c-1)
+* [C++](#cpp)
 * [Database](#database)
   * [SQL](#sql)
 * [Delphi](#delphi)
@@ -61,7 +61,7 @@
 * [Programmazione ad oggetti in C#](https://www.youtube.com/watch?v=aSgikNnGEKM&list=PLktbfd3yXeH8yQpHM3O468k8l-aTC6Hl6) - G. Pellegrini Parisi 
 
 
-### C++
+<h3 id="cpp">C++</h3>
 
 * [C++ 11](https://www.youtube.com/playlist?list=PL0qAPtx8YtJfZpJD7uFxAXglkiHSEhktG) (F. Camuso)
 * [C++ libreria QT - playlist 1](https://www.youtube.com/playlist?list=PL0qAPtx8YtJdH4GVwL_3QeJjPcz3DHE2t) (F. Camuso)