Improve Erlang function sum example (#1754)

7006 · web-flow · commit 5778948258bc · 2024-03-04T09:09:58.000+01:00
diff --git a/crash-course.markdown b/crash-course.markdown
@@ -531,8 +531,8 @@ sum(1, 2).
 sum([1], [2]).
 %=> [1, 2]
 
-sum("a", "b").
-%=> "ab"
+sum(<<"a">>, <<"b">>).
+%=> <<"ab">>
 ```
 
 **Elixir**
