fix: update rust docs PR needs a path (#742)

It is being checked out in a subdir, so we need to give the PR a path to it.

.github/workflows/update-docs.yml

@@ -46,6 +46,7 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: "chore(docs): Update Rust docs"
           branch: docs/release
+          path: tauri-docs
           title: Update Docs
           labels: "new release"
           body: |