move link to the right module

Author: lor6

core-java-modules/core-java-lang-oop-types-2/README.md

@@ -11,3 +11,4 @@ This module contains articles about types in Java
 - [Comparing a String to an Enum Value in Java](https://www.baeldung.com/java-comparing-string-to-enum)
 - [Implementing toString() on enums in Java](https://www.baeldung.com/java-enums-tostring)
 - [Checking if an Object’s Type Is Enum](https://www.baeldung.com/java-check-object-enum)
+- [Declare an Enum in an Inner Class in Java](https://www.baeldung.com/java-declare-enum-inner-class)

core-java-modules/core-java-lang-oop-types/README.md

@@ -14,3 +14,4 @@ This module contains articles about types in Java
 - [Determine if an Object Is of Primitive Type](https://www.baeldung.com/java-object-primitive-type)
 - [Extending Enums in Java](https://www.baeldung.com/java-extending-enums)
 - [Java Class File Naming Conventions](https://www.baeldung.com/java-class-file-naming)
+