update approaches description

Author: dantelmomsft

app/backend/src/main/java/com/microsoft/openai/samples/rag/ask/approaches/semantickernel/JavaSemanticKernelChainsApproach.java

@@ -20,7 +20,8 @@
 import java.util.Set;
 
 /**
- *    Accomplish the same task as in the Retrieve-then-read approach but using Semantic Kernel framework and Planner goal oriented concept.
+ *    Use Java Semantic Kernel framework with semantic and native functions chaining. It uses an imperative style for AI orchestration through semantic kernel functions chaining.
+ *    InformationFinder.Search native function and RAG.AnswerQuestion semantic function are called sequentially.
  */
 @Component
 public class JavaSemanticKernelChainsApproach implements RAGApproach<String, RAGResponse> {

app/backend/src/main/java/com/microsoft/openai/samples/rag/ask/approaches/semantickernel/JavaSemanticKernelPlannerApproach.java

@@ -20,7 +20,8 @@
 import java.util.Set;
 
 /**
- *    Accomplish the same task as in the Retrieve-then-read approach but using Semantic Kernel framework and Planner goal oriented concept.
+ *    Use Java Semantic Kernel framework with built-in Planner for functions orchestration. It uses a declarative style for AI orchestration through the built-in SequentialPlanner.
+ *    SequentialPlanner call OpenAI to generate a plan for answering a question using available skills/plugins: InformationFinder and RAG
  */
 @Component
 public class JavaSemanticKernelPlannerApproach implements RAGApproach<String, RAGResponse> {