Fix function call example

Author: aerosol

crash-course.markdown

@@ -168,7 +168,7 @@ orddict:new().
 to invoke the `new` function from the `orddict` module. In Elixir, use the dot `.` in place of the colon `:`
 
 ```elixir
-Kernel.self
+Orddict.new
 ```
 
 **Note**. Since Erlang modules are represented by atoms, you may invoke Erlang functions in Elixir as follows: