[Doc] Update community contributors and versioning naming to follow vLLM (#5820)

### What this PR does / why we need it?

This pull request updates documentation to align with vLLM's community
standards.
- Change `Maintainers` to `Committers` to follow vLLM naming:
https://docs.vllm.ai/en/latest/governance/committers/
- Change release branch policy from `vX.Y.Z-dev` to `releases/vX.Y.Z`

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
doc ci passed
- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

README.zh.md

@@ -68,7 +68,7 @@ vLLM 昇腾插件 (`vllm-ascend`) 是一个由社区维护的让vLLM在Ascend NP
 vllm-ascend有主干分支和开发分支。
 
 - **main**: 主干分支，与vLLM的主干分支对应，并通过昇腾CI持续进行质量看护。
-- **vX.Y.Z-dev**: 开发分支，随vLLM部分新版本发布而创建，比如`v0.7.3-dev`是vllm-asend针对vLLM `v0.7.3`版本的开发分支。
+- **releases/vX.Y.Z**: 开发分支，随vLLM部分新版本发布而创建，比如`releases/v0.13.0`是vllm-asend针对vLLM `v0.13.0` 版本的开发分支。
 
 下面是维护中的分支：