docs: complete containerization example (#4356)

* docs: complete containerization example * docs: add comment
jina-ai · Feb 16, 2022 · 0765a24 · 0765a24
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diff --git a/README.md b/README.md
@@ -256,8 +256,13 @@ You can containerize the Executors and play them in a sandbox thanks to [Hub](ht
 
 4. In particular, sandbox hosts your Executor on Jina Cloud and allows you to play with it from local:
     ```python
+    from docarray import DocumentArray
     from jina import Flow
 
+    index_data = DocumentArray.pull(
+        'demo-leftda', show_progress=True
+    )  # Download the dataset as shown in the tutorial above
+
     f = Flow().add(uses='jinahub+sandbox://2k7gsejl')
 
     with f: