Update vale-linting.yml (#480)

Author: theletterf

.github/workflows/vale-linting.yml

@@ -1,22 +1,24 @@
 name: Vale Documentation Linting
 
 on:
-  pull_request:
+  pull_request_target:  # ← This is the key change
+    types: [opened, synchronize, reopened]
     paths:
       - '**.md'
       - '**.adoc'
 
 permissions:
   contents: read
-  pull-requests: write  # Required for posting PR comments
+  pull-requests: write
 
 jobs:
   vale:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
+      - name: Checkout PR branch
         uses: actions/checkout@v5
         with:
+          ref: ${{ github.event.pull_request.head.sha }}  # ← Checkout the PR's code
           fetch-depth: 0
 
       - name: Run Elastic Vale Linter