[Doc] Fix format of multimodal_inputs.md (#31800)

Signed-off-by: BlankR <hjyblanche@gmail.com>

docs/features/multimodal_inputs.md

@@ -166,16 +166,18 @@ Full example: [examples/offline_inference/vision_language_multi_image.py](../../
 
 If using the [LLM.chat](../models/generative_models.md#llmchat) method, you can pass images directly in the message content using various formats: image URLs, PIL Image objects, or pre-computed embeddings:
 
-```python
-from vllm import LLM
-from vllm.assets.image import ImageAsset
+??? code
 
-llm = LLM(model="llava-hf/llava-1.5-7b-hf")
-image_url = "https://picsum.photos/id/32/512/512"
-image_pil = ImageAsset('cherry_blossom').pil_image
-image_embeds = torch.load(...)
+    ```python
+    from vllm import LLM
+    from vllm.assets.image import ImageAsset
 
-conversation = [
+    llm = LLM(model="llava-hf/llava-1.5-7b-hf")
+    image_url = "https://picsum.photos/id/32/512/512"
+    image_pil = ImageAsset('cherry_blossom').pil_image
+    image_embeds = torch.load(...)
+
+    conversation = [
         {"role": "system", "content": "You are a helpful assistant"},
         {"role": "user", "content": "Hello"},
         {"role": "assistant", "content": "Hello! How can I assist you today?"},
@@ -200,15 +202,15 @@ conversation = [
                 },
             ],
         },
-]
+    ]
 
-# Perform inference and log output.
-outputs = llm.chat(conversation)
+    # Perform inference and log output.
+    outputs = llm.chat(conversation)
 
-for o in outputs:
+    for o in outputs:
         generated_text = o.outputs[0].text
         print(generated_text)
-```
+    ```
 
 Multi-image input can be extended to perform video captioning. We show this with [Qwen2-VL](https://huggingface.co/Qwen/Qwen2-VL-2B-Instruct) as it supports videos:
 
@@ -893,6 +895,8 @@ The following example demonstrates how to pass image embeddings to the OpenAI se
 
 For Online Serving, you can also skip sending media if you expect cache hits with provided UUIDs. You can do so by sending media like this:
 
+??? code
+
     ```python
         # Image/video/audio URL:
         {