Update openai-chat.adoc (#951)

* Added a missing semicolon in the sample code in the documentation

Author: rapenumaka

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/openai-chat.adoc

@@ -273,7 +273,7 @@ var openAiChatOptions = OpenAiChatOptions.builder()
             .withTemperature(0.4)
             .withMaxTokens(200)
         .build();
-var chatModel = new OpenAiChatModel(openAiApi, openAiChatOptions)
+var chatModel = new OpenAiChatModel(openAiApi, openAiChatOptions);
 
 
 ChatResponse response = chatModel.call(