[FOLLOWUP] fix name and format in accuracy test (#1288) (#1435)

### What this PR does / why we need it?
fix accuracy test:
1. fix accuracy report
like:https://vllm-ascend--1429.org.readthedocs.build/en/1429/developer_guide/evaluation/accuracy_report/Qwen2.5-7B-Instruct-V0.html
2. fix create pr for report

Signed-off-by: hfadzxy <starmoon_zhang@163.com>

.github/workflows/accuracy_test.yaml

@@ -380,7 +380,7 @@ jobs:
             const pr = await github.rest.pulls.create({
               owner: 'vllm-project',
               repo: 'vllm-ascend',
-              head: `${{ github.actor }}:${{ env.BRANCH_NAME }}`,
+              head: `vllm-ascend-ci:${{ env.BRANCH_NAME }}`,
               base: '${{ github.event.inputs.vllm-ascend-version }}',
               title: `[Doc] Update accuracy reports for ${{ github.event.inputs.vllm-ascend-version }}`,
               body: `The accuracy results running on NPU Altlas A2 have changed, updating reports for:

benchmarks/scripts/run_accuracy.py

@@ -138,8 +138,6 @@ def generate_md(model_name, tasks_list, args, datasets):
 ```bash
 {run_cmd}
 ```
-  </div>
-  <div>&nbsp;</div>
   """
 
     header = (