Rename notebook

We're not using the term "bulk import" anymore. So
renaming this notebook to "Import from object storage".

Author: jseldess

docs/pinecone-bulk-import.ipynb

@@ -9,7 +9,7 @@
       "source": [
         "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/pinecone-io/examples/blob/master/docs/pinecone-bulk-import.ipynb) [![Open nbviewer](https://raw.githubusercontent.com/pinecone-io/examples/master/assets/nbviewer-shield.svg)](https://nbviewer.org/github/pinecone-io/examples/blob/master/docs/pinecone-bulk-import.ipynb)\n",
         "\n",
-        "# Pinecone Bulk Import\n",
+        "# Import from object storage\n",
         "\n",
         "**Note:** This feature is in [public preview](https://docs.pinecone.io/release-notes/feature-availability) and available only on [Standard and Enterprise plans](https://www.pinecone.io/pricing/)."
       ]