fix wrong JDK version for record introduction

fixes java#137

Author: danthe1st

app/pages/learn/01_tutorial/03_getting-to-know-the-language/04_classes_objects/01_enums.md

@@ -212,6 +212,6 @@ and reading these configuration files in the program in cases like this.
 <a id="conclusion">&nbsp;</a>
 ## Conclusion
 
-Enums provide a simple and safe way of representing a fixed set of constants while keeping most of the flexibilities of classes. They are a special type of class that can be used to write code that is elegant, readable, maintainable and works well with other modern Java features like [switch expressions](id:lang.classes-objects.switch-expression). Another special class is the Record class introduced in Java 19. Visit our [records tutorial](id:lang.records) to learn more.
+Enums provide a simple and safe way of representing a fixed set of constants while keeping most of the flexibilities of classes. They are a special type of class that can be used to write code that is elegant, readable, maintainable and works well with other modern Java features like [switch expressions](id:lang.classes-objects.switch-expression). Another special class is the Record class introduced in JDK 16. Visit our [records tutorial](id:lang.records) to learn more.
 
 To learn more about enums, visit the [`java.lang.Enum`](javadoc:Enum) javadoc.