Docs: fix typo (#263)

Signed-off-by: Carson Yang <yangchuansheng33@gmail.com>

.github/workflows/deploy-preview.yml

@@ -18,7 +18,7 @@ jobs:
 
     # Job outputs
     outputs:
-      docs: ${{ steps.filter.outputs.docs }}
+      url: ${{ steps.vercel-action.outputs.preview-url }}
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
@@ -26,6 +26,8 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
         with:
+          ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           submodules: recursive # Fetch submodules
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod
 
@@ -76,7 +78,7 @@ jobs:
       - name: Write md
         run: |
           echo "# 🤖 Generated by deploy action" > report.md
-          echo "[Deploy Actions Address](${{ needs.deploy-preview.outputs.docs }})" >> report.md
+          echo "[Deploy Actions Address](${{ needs.deploy-preview.outputs.url }})" >> report.md
           cat report.md
       - name: Gh Rebot for Sealos
         uses: labring/gh-rebot@v0.0.6