[Doc] Add Qwen2.5-VL eager mode doc (#1394)

### What this PR does / why we need it?
Add Qwen2.5-VL eager mode doc.

---------

Signed-off-by: shen-shanshan <467638484@qq.com>

docs/source/tutorials/single_npu_multimodal.md

@@ -29,6 +29,9 @@ docker run --rm \
 Setup environment variables:
 
 ```bash
+# Use vllm v1 engine
+export VLLM_USE_V1=1
+
 # Load model from ModelScope to speed up download
 export VLLM_USE_MODELSCOPE=True
 
@@ -57,6 +60,7 @@ llm = LLM(
     model=MODEL_PATH,
     max_model_len=16384,
     limit_mm_per_prompt={"image": 10},
+    enforce_eager=True,
 )
 
 sampling_params = SamplingParams(
@@ -103,13 +107,11 @@ outputs = llm.generate([llm_inputs], sampling_params=sampling_params)
 generated_text = outputs[0].outputs[0].text
 
 print(generated_text)
-
 ```
 
 If you run this script successfully, you can see the info shown below:
 
 ```bash
-Processed prompts: 100%|███████████████| 1/1 [00:11<00:00, 11.29s/it, est. speed input: 9.48 toks/s, output: 20.55 toks/s]
 The image displays a logo consisting of two main elements: a stylized geometric design and a pair of text elements.
 
 1. **Geometric Design**: On the left side of the image, there is a blue geometric design that appears to be made up of interconnected shapes. These shapes resemble a network or a complex polygonal structure, possibly hinting at a technological or interconnected theme. The design is monochromatic and uses only blue as its color, which could be indicative of a specific brand or company.
@@ -141,10 +143,15 @@ docker run --rm \
 -v /etc/ascend_install.info:/etc/ascend_install.info \
 -v /root/.cache:/root/.cache \
 -p 8000:8000 \
+-e VLLM_USE_V1=1 \
 -e VLLM_USE_MODELSCOPE=True \
 -e PYTORCH_NPU_ALLOC_CONF=max_split_size_mb:256 \
 -it $IMAGE \
-vllm serve Qwen/Qwen2.5-VL-7B-Instruct --dtype bfloat16 --max_model_len 16384 --max-num-batched-tokens 16384
+vllm serve Qwen/Qwen2.5-VL-7B-Instruct \
+--dtype bfloat16 \
+--max_model_len 16384 \
+--max-num-batched-tokens 16384 \
+--enforce-eager
 ```
 
 :::{note}