docs: use better import for `ProxyRotator` class

docs/fetching/static.md

@@ -31,7 +31,7 @@ All methods for making requests here share some arguments, so let's discuss them
 - **proxy**: As the name implies, the proxy for this request is used to route all traffic (HTTP and HTTPS). The format accepted here is `http://username:password@localhost:8030`.
 - **proxy_auth**: HTTP basic auth for proxy, tuple of (username, password).
 - **proxies**: Dict of proxies to use. Format: `{"http": proxy_url, "https": proxy_url}`.
-- **proxy_rotator**: A `ProxyRotator` instance for automatic proxy rotation. Cannot be combined with `proxy` or `proxies`. Import from `scrapling.engines.toolbelt import ProxyRotator`.
+- **proxy_rotator**: A `ProxyRotator` instance for automatic proxy rotation. Cannot be combined with `proxy` or `proxies`.
 - **headers**: Headers to include in the request. Can override any header generated by the `stealthy_headers` argument
 - **max_redirects**: Maximum number of redirects. **Defaults to 30**, use -1 for unlimited.
 - **verify**: Whether to verify HTTPS certificates. **Defaults to True**.
@@ -194,8 +194,7 @@ with FetcherSession(
 You can also use a `ProxyRotator` with `FetcherSession` for automatic proxy rotation across requests:
 
 ```python
-from scrapling.fetchers import FetcherSession
-from scrapling.engines.toolbelt import ProxyRotator
+from scrapling.fetchers import FetcherSession, ProxyRotator
 
 rotator = ProxyRotator([
     'http://proxy1:8080',