[DOC] update modelslim version (#908)

1. update modelslim version to fix deepseek related issues
2. add note for "--quantization ascend"

Signed-off-by: 22dimensions <waitingwind@foxmail.com>

Author: 22dimensions

docs/source/tutorials/multi_npu_quantization.md

@@ -36,7 +36,7 @@ see https://www.modelscope.cn/models/vllm-ascend/QwQ-32B-W8A8
 
 ```bash
 # (Optional)This tag is recommended and has been verified
-git clone https://gitee.com/ascend/msit -b modelslim-VLLM-8.1.RC1.b020
+git clone https://gitee.com/ascend/msit -b modelslim-VLLM-8.1.RC1.b020_001
 
 cd msit/msmodelslim
 # Install by run this script
@@ -68,6 +68,10 @@ The converted model files looks like:
 ```
 
 Run the following script to start the vLLM server with quantize model:
+
+:::{note}
+The value "ascend" for "--quantization" argument will be supported after [a specific PR](https://github.com/vllm-project/vllm-ascend/pull/877) is merged and released, you can cherry-pick this commit for now.
+:::
 ```bash
 vllm serve /home/models/QwQ-32B-w8a8  --tensor-parallel-size 4 --served-model-name "qwq-32b-w8a8" --max-model-len 4096 --quantization ascend
 ```