[Misc] Fix typo in the example file (#12896)

Signed-off-by: Zhao Ke <yingxiongraomingzk@gmail.com>

examples/online_serving/openai_chat_embedding_client_for_multimodal.py

@@ -44,7 +44,7 @@ def vlm2vec():
 
 def dse_qwen2_vl(inp: dict):
     # Embedding an Image
-    if inp["dtype"] == "image":
+    if inp["type"] == "image":
         messages = [{
             "role":
             "user",
@@ -113,10 +113,10 @@ if __name__ == '__main__':
         vlm2vec()
     elif args.model == "dse_qwen2_vl":
         dse_qwen2_vl({
-            "dtye": "image",
+            "type": "image",
             "image_url": image_url,
         })
         dse_qwen2_vl({
-            "dtype": "text",
+            "type": "text",
             "content": "What is the weather like today?",
         })