[Lint]Style: reformat markdown files via markdownlint (#5884)

### What this PR does / why we need it?
reformat markdown files via markdownlint

- vLLM version: v0.13.0
- vLLM main:
bde38c11df

---------

Signed-off-by: root <root@LAPTOP-VQKDDVMG.localdomain>
Signed-off-by: MrZ20 <2609716663@qq.com>
Co-authored-by: root <root@LAPTOP-VQKDDVMG.localdomain>

.github/workflows/_pre_commit.yml

@@ -28,9 +28,11 @@ jobs:
     - name: cp problem matchers
       run: |
         cp .github/workflows/matchers/actionlint.json "$RUNNER_TEMP/actionlint.json"
+        cp .github/workflows/matchers/markdownlint.json "$RUNNER_TEMP/markdownlint.json"
         cp .github/workflows/matchers/mypy.json "$RUNNER_TEMP/mypy.json"
 
     - run: echo "::add-matcher::$RUNNER_TEMP/actionlint.json"
+    - run: echo "::add-matcher::$RUNNER_TEMP/markdownlint.json"
     - run: echo "::add-matcher::$RUNNER_TEMP/mypy.json"
 
     - name: Checkout vllm-project/vllm repo

.github/workflows/matchers/markdownlint.json

@@ -0,0 +1,17 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "markdownlint",
+      "pattern": [
+        {
+          "regexp": "^([^:]*):(\\d+):?(\\d+)?\\s([\\w-\\/]*)\\s(.*)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "code": 4,
+          "message": 5
+        }
+      ]
+    }
+  ]
+}