fix openapi-chat description in upgrade-notes

Author: Jiafu Tang

spring-ai-docs/src/main/antora/modules/ROOT/pages/upgrade-notes.adoc

@@ -65,10 +65,10 @@ to
 
 The following OpenAi Autoconfiguration chat properties has changed
 
-* from `spring.ai.openai.model` to `spring.ai.openai.chat.model`.
-* from `spring.ai.openai.temperature` to `spring.ai.openai.chat.temperature`.
+* from `spring.ai.openai.model` to `spring.ai.openai.chat.options.model`.
+* from `spring.ai.openai.temperature` to `spring.ai.openai.chat.options.temperature`.
 
-Find updated documentation about the OpenAi properties: https://docs.spring.io/spring-ai/reference/api/clients/openai.html
+Find updated documentation about the OpenAi properties: https://docs.spring.io/spring-ai/reference/api/clients/openai-chat.html
 
 === December 27, 2023 Update