[Bugfix] add compilation/__init__.py to fix import error (#1152)

1. Add `__init__.py` for vllm_ascend/compilation to make sure it's a
python module
2. Fix model runner bug to keep the same with vllm
3. Add release note for 0.9.0rc2

---------

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

docs/source/user_guide/graph_mode.md

@@ -54,7 +54,7 @@ outputs = model.generate("Hello, how are you?")
 online example:
 
 ```shell
-vllm serve Qwen/Qwen2-7B-Instruct --additional-config='{"torchair_graph_config": {"enable": True}}'
+vllm serve Qwen/Qwen2-7B-Instruct --additional-config='{"torchair_graph_config": {"enable": true}}'
 ```
 
 You can find more detail about additional config [here](./additional_config.md)