Update deepseek.mdx (#19324)

Author: kathayl

src/content/docs/ai-gateway/providers/deepseek.mdx

@@ -54,7 +54,7 @@ curl https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/deepseek/cha
 }'
 ```
 
-### Use OpenAI with JavaScript
+### Use DeepSeek with JavaScript
 
 If you are using the OpenAI SDK, you can set your endpoint like this: