[JAVA-2306] Fixed READMEs

* spring-jpa-2

* spring-data-jpa-repo-2

* spring-data-jpa-query-2

* spring-jdbc

* spring-persistence-simple

persistence-modules/spring-persistence-simple/README.md

@@ -4,15 +4,8 @@
 
 
 ### Relevant Articles: 
-- [A Guide to JPA with Spring](https://www.baeldung.com/the-persistence-layer-with-spring-and-jpa)
-- [Bootstrapping Hibernate 5 with Spring](http://www.baeldung.com/hibernate-5-spring)
-- [The DAO with Spring and Hibernate](https://www.baeldung.com/persistence-layer-with-spring-and-hibernate)
-- [Simplify the DAO with Spring and Java Generics](https://www.baeldung.com/simplifying-the-data-access-layer-with-spring-and-java-generics)
-- [Transactions with Spring and JPA](https://www.baeldung.com/transaction-configuration-with-jpa-and-spring)
-- [Introduction to Spring Data JPA](http://www.baeldung.com/the-persistence-layer-with-spring-data-jpa)
-- [Spring Data JPA @Query](http://www.baeldung.com/spring-data-jpa-query)
-- [Spring JDBC](https://www.baeldung.com/spring-jdbc-jdbctemplate)
 - [Transaction Propagation and Isolation in Spring @Transactional](https://www.baeldung.com/spring-transactional-propagation-isolation)
+- [Mock JNDI Datasource](https://www.baeldung.com/spring-mock-jndi-datasource)
 
 ### Eclipse Config 
 After importing the project into Eclipse, you may see the following error: