Update deepseek-chat.adoc (spring-projects#2515)

Signed-off-by: cc0824 <[email protected]>

Author: cc0824

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

@@ -96,7 +96,7 @@ The prefix `spring.ai.openai` is used as the property prefix that lets you conne
 | Property | Description | Default
 
 | spring.ai.openai.base-url   | The URL to connect to. Must be set to `https://api.deepseek.com` | -
-| spring.ai.openai.chat.api-key    | Your DeepSeek API Key | -
+| spring.ai.openai.api-key    | Your DeepSeek API Key | -
 |====