update release note for suffix decoding (#5009)

update release note for suffix decoding

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: fluctlux <38945811+fluctlux@users.noreply.github.com>

docs/source/user_guide/release_notes.md

@@ -14,7 +14,7 @@ This is the first release candidate of v0.12.0 for vLLM Ascend. We landed lots o
 - Lots of triton kernel are added. The performance of vLLM Ascend, especially Qwen3-Next and DeepSeek 3.2 is improved. Please note that triton is not installed and enabled by default, but we suggest to enable it in most case. You can download and install it by hand from [package url](https://vllm-ascend.obs.cn-north-4.myhuaweicloud.com/vllm-ascend/triton_ascend-3.2.0.dev2025110717-cp311-cp311-manylinux_2_27_aarch64.whl). If you're running vLLM Ascend with X86, you need to build triton ascend by yourself from [source](https://gitcode.com/Ascend/triton-ascend)
 - Lots of Ascend ops are added to improve the performance. It means that from this release vLLM Ascend only works with custom ops built. So we removed the env `COMPILE_CUSTOM_KERNELS`. You can not set it to 0 now.
 - speculative decode method `MTP` is more stable now. It can be enabled with most case and decode token number can be 1,2,3.
-- speculative decode method `suffix` is supported now.
+- speculative decode method `suffix` is supported now. Thanks for the contribution from China Merchants Bank.
 - llm-comppressor quantization tool with W8A8 works now. You can now deploy the model with W8A8 quantization from this tool directly.
 - W4A4 quantization works now.
 - Support features flashcomm1 and flashcomm2 in paper [flashcomm](https://arxiv.org/pdf/2412.04964) [#3004](https://github.com/vllm-project/vllm-ascend/pull/3004) [#3334](https://github.com/vllm-project/vllm-ascend/pull/3334)
@@ -44,6 +44,7 @@ This is the first release candidate of v0.12.0 for vLLM Ascend. We landed lots o
 - DeepSeek 3.2 doesn't work with chat template. It because that vLLM v0.12.0 doesn't support it. We'll support in the next v0.13.0rc1 version.
 - DeepSeek 3.2 doesn't work with high concurrency in some case. We'll fix it in next release. [#4996](https://github.com/vllm-project/vllm-ascend/pull/4996)
 - We notice that bf16/fp16 model doesn't perform well, it's mainly because that `VLLM_ASCEND_ENABLE_NZ` is enabled by default. Please set `VLLM_ASCEND_ENABLE_NZ=0` to disable it. We'll add the auto detection mechanism in next release.
+- speculative decode method `suffix` doesn't work. We'll fix it in next release. You can pick this commit to fix the issue: [#4813](https://github.com/vllm-project/vllm-ascend/pull/4813)
 
 ## v0.11.0rc3 - 2025.12.03
 This is the third release candidate of v0.11.0 for vLLM Ascend. For quality reasons, we released a new rc before the official release. Thanks for all your feedback. Please follow the [official doc](https://vllm-ascend.readthedocs.io/en/v0.11.0-dev) to get started.