ci: commit message update

Author: tsuyoshicho

.github/workflows/generate.yml

@@ -40,7 +40,9 @@ jobs:
           cwd: './target'
           author_name: '${{ github.actor }}'
           author_email: '${{ github.actor }}@users.noreply.github.com'
-          message: 'Generated by GitHub workflow ${{ github.run_id }}'
+          message: |-
+            Generated by GitHub workflow ${{ github.run_id }}
+            https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}
           branch: gh-pages
         env:
           GITHUB_TOKEN: ${{ secrets.VIMDOC_JP_TOKEN }}