JAVA-20168 Update article links in README.md (eugenp#14307)

Co-authored-by: timis1 <[email protected]>

Author: timis1

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

@@ -7,4 +7,5 @@
 - [Resolving “Failed to Configure a DataSource” Error](https://www.baeldung.com/spring-boot-failed-to-configure-data-source)
 - [Hibernate Field Naming with Spring Boot](https://www.baeldung.com/hibernate-field-naming-spring-boot)
 - [Spring Boot with Hibernate](https://www.baeldung.com/spring-boot-hibernate)
+- [A Guide to Spring AbstractRoutingDatasource](https://www.baeldung.com/spring-abstract-routing-data-source)
 - More articles: [[more -->]](../spring-boot-persistence-2)

persistence-modules/spring-jpa/README.md

@@ -6,7 +6,6 @@
 - [Sorting with JPA](https://www.baeldung.com/jpa-sort)
 - [Self-Contained Testing Using an In-Memory Database](https://www.baeldung.com/spring-jpa-test-in-memory-database)
 - [Spring Data Annotations](http://www.baeldung.com/spring-data-annotations)
-- [A Guide to Spring AbstractRoutingDatasource](https://www.baeldung.com/spring-abstract-routing-data-source)
 - More articles: [[next -->]](/spring-jpa-2)
 
 ### Eclipse Config