Fix the used if block

Author: ZPascal

.github/workflows/pull-request-checks.yml

@@ -101,15 +101,15 @@ jobs:
             docs
 
       - name: Commit files
-        if: steps.verify-changed-files.outputs.files_exists == 'false'
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
         run: |
           git config --local user.email "github-actions[bot]@users.noreply.github.com"
           git config --local user.name "github-actions[bot]"
           git add --force docs
           git commit -m "Add coverage badge and documentation"
 
       - name: Push changes
-        if: steps.verify-changed-files.outputs.files_exists == 'false'
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
         uses: ad-m/github-push-action@master
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}