add missing huggingface rst

docs/integrations/huggingface.rst

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+HuggingFace
+-----------
+
+The Hugging Face Hub has a great amount of pre-trained models and datasets available.
+
+It is easy to convert a Huggingface dataset to Lance dataset:
+
+.. code-block:: python
+
+    # Huggingface datasets
+    import datasets
+    import lance
+
+    lance.write(datasets.load_dataset(
+        "poloclub/diffusiondb", split="train[:10]"
+    ), "diffusiondb_train.lance")