Use conventional commits for vimdoc commits (#14)

Currently autogenerate vimdocs create "autogenerate vimdoc" commit which does not have conventional commit prefix which makes it clutter the release note shown by package managers like lazy.nvim. Once added chore: it is filtered out like this

Author: dmtrKovalenko

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Push changes
         uses: stefanzweifel/git-auto-commit-action@v6
         with:
-          commit_message: "auto-generate vimdoc"
+          commit_message: "chore(ci): auto-generate vimdoc"
           commit_user_name: "github-actions[bot]"
           commit_user_email: "github-actions[bot]@users.noreply.github.com"
           commit_author: "github-actions[bot] <github-actions[bot]@users.noreply.github.com>"