feat (#2749)

Author: StudiousXiaoYu

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/retrieval-augmented-generation.adoc

@@ -270,7 +270,7 @@ MultiQueryExpander queryExpander = MultiQueryExpander.builder()
     .chatClientBuilder(chatClientBuilder)
     .numberOfQueries(3)
     .build();
-List<Query> queries = expander.expand(new Query("How to run a Spring Boot app?"));
+List<Query> queries = queryExpander.expand(new Query("How to run a Spring Boot app?"));
 ----
 
 By default, the `MultiQueryExpander` includes the original query in the list of expanded queries. You can disable this behavior