Update openai-chat.adoc

Existing example displays a typo in the code example for Runtime Options:

ChatResponse response = chatModel.call(
    new Prompt(
        "Generate the names of 5 famous pirates.",
        OpenAiChatOptions.builder()
            .model("gpt-4-o")
            .temperature(0.4)
        .build()
    ));

Using gpt-4-0 generates this error:
org.springframework.ai.retry.NonTransientAiException: 404 - {
    "error": {
        "message": "The model `gpt-4-o` does not exist or you do not have access to it.",
        "type": "invalid_request_error",
        "param": null,
        "code": "model_not_found"
    }
}

Changing the model String in the example to "gpt-4o" resolves this.

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

@@ -154,7 +154,7 @@ ChatResponse response = chatModel.call(
     new Prompt(
         "Generate the names of 5 famous pirates.",
         OpenAiChatOptions.builder()
-            .model("gpt-4-o")
+            .model("gpt-4o")
             .temperature(0.4)
         .build()
     ));