Fix typo in retrieval-augmented-generation.adoc (#2652)

reulsts -> results

Signed-off-by: 吴伟杰 <wuweijie@apache.org>

Author: TeslaCN

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

@@ -47,7 +47,7 @@ To restrict the types of documents that are searched, the `SearchRequest` takes
 
 This filter expression can be configured when creating the `QuestionAnswerAdvisor` and hence will always apply to all `ChatClient` requests or it can be provided at runtime per request.
 
-Here is how to create an instance of `QuestionAnswerAdvisor` where the threshold is `0.8` and to return the top `6` reulsts.
+Here is how to create an instance of `QuestionAnswerAdvisor` where the threshold is `0.8` and to return the top `6` results.
 
 [source,java]
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