message: manual: Fix broken link in functions page in book
diff: @@ -46,7 +46,7 @@ You'd get as output of that script:
  ion: function argument has invalid type: expected int, found value 'a'
  ```
  -You can use any of the [supported types](ch04-00-variables.md#Supported Types).
  +You can use any of the [supported types](variables/00-variables.md#supported-primitive-types).
  ## Multiple arguments
  