Add Info to the Erlang Runtime System Book (#9122)

* Add The Erlang Runtime System

* Update free-programming-books-langs.md

books/free-programming-books-langs.md

@@ -724,7 +724,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Learn You Some Erlang For Great Good](http://learnyousomeerlang.com) - Fred Hebert (HTML)
 * [Making reliable distributed systems in the presence of software errors](http://www.erlang.org/download/armstrong_thesis_2003.pdf) - Joe Armstrong (PDF)
 * [Stuff Goes Bad: Erlang in Anger](https://www.erlang-in-anger.com) - Fred Herbert (PDF)
-* [The BEAM Book](https://blog.stenmans.org/theBeamBook) (HTML)
+* [The Erlang Runtime System](https://blog.stenmans.org/theBeamBook) - Erik Stenman (HTML)
 
 
 ### F Sharp