Merge pull request #11730 from Asjad-J/master

BAEL-47433 - add links to github-baeldung articles

core-java-modules/core-java-15/README.md

@@ -4,4 +4,5 @@ This module contains articles about Java 15.
 
 ### Relevant articles
 
+- [Hidden Classes in Java 15](https://www.baeldung.com/java-hidden-classes)
 - [Sealed Classes and Interfaces in Java 15](https://www.baeldung.com/java-sealed-classes-interfaces)

core-java-modules/core-java-17/README.md

@@ -1,5 +1,6 @@
 ### Relevant articles:
 
+- [An Introduction to InstantSource in Java 17](https://www.baeldung.com/java-instantsource)
 - [Pattern Matching for Switch](https://www.baeldung.com/java-switch-pattern-matching)
 - [Introduction to HexFormat in Java 17](https://www.baeldung.com/java-hexformat)
 - [New Features in Java 17](https://www.baeldung.com/java-17-new-features)

core-java-modules/core-java-string-algorithms-3/README.md

@@ -4,6 +4,7 @@ This module contains articles about string-related algorithms.
 
 ### Relevant Articles:
 
+- [Generating a Java String of N Repeated Characters](https://www.baeldung.com/java-string-of-repeated-characters)
 - [Check if Two Strings are Anagrams in Java](https://www.baeldung.com/java-strings-anagrams)
 - [Email Validation in Java](https://www.baeldung.com/java-email-validation-regex)
 - [Check if the First Letter of a String is Uppercase](https://www.baeldung.com/java-check-first-letter-uppercase)

gradle/maven-to-gradle/README.md

@@ -0,0 +1,3 @@
+## Relevant Articles:
+
+[Convert a Maven Build to Gradle](https://www.baeldung.com/maven-convert-to-gradle)

persistence-modules/java-cassandra/README.md

@@ -1,4 +1,6 @@
 ### Relevant Articles:
+
+- [Cassandra Batch in Cassandra Query Language and Java](https://www.baeldung.com/java-cql-cassandra-batch)
 - [A Guide to Cassandra with Java](http://www.baeldung.com/cassandra-with-java)
 - [Intro to DataStax Java Driver for Apache Cassandra](https://www.baeldung.com/cassandra-datastax-java-driver)
 - [CQL Data Types](https://www.baeldung.com/cassandra-data-types)

testing-modules/junit-5-advanced/README.md

@@ -1,5 +1,6 @@
 ## Relevant Articles:
 
+- [Get the Name of the Currently Executing Test in JUnit](https://www.baeldung.com/junit-get-name-of-currently-executing-test)
 - [JUnit 5 TestWatcher API](https://www.baeldung.com/junit-testwatcher)
 - [JUnit Custom Display Name Generator API](https://www.baeldung.com/junit-custom-display-name-generator)
 - [@TestInstance Annotation in JUnit 5](https://www.baeldung.com/junit-testinstance-annotation)