Update to mention AWS and context

Author: fedorov

notebooks/getting_started/part1_prerequisites.ipynb

@@ -22,11 +22,13 @@
         "\n",
         "This notebook is part of [the \"Getting started with IDC\" series](https://github.com/ImagingDataCommons/IDC-Examples/tree/master/notebooks/getting_started) introducing NCI Imaging Data Commons to the users who want to interact with IDC programmatically.\n",
         "\n",
-        "In this notebook you will learn how to set up your google account to be able to use Google Cloud Platform (GCP), which is the location of IDC data.\n",
+        "In this notebook you will learn how to set up your google account to be able to use Google Cloud Platform (GCP), which, along with Amazon AWS buckets, is one the locations from where you can download IDC data.\n",
+        "\n",
+        "While you can download IDC data from AWS (and you will learn how to do this in part 3 of the tutorial), you do not need to authenticate in order to download data, and it is currently not possible to search IDC data using AWS. In this tutorial we focuse on prerequisites for using GCP, since this is what you will need if you would like to search IDC data programmatically.\n",
         "\n",
         "Initial version: Nov 2022\n",
         "\n",
-        "Updated: "
+        "Updated: May 2023"
       ]
     },
     {
@@ -61,7 +63,9 @@
         "\n",
         "GCP is a cloud-based environment that provides access to a suite of tools and services that include compute, storage and database resources, to name a few.\n",
         "\n",
-        "IDC is built upon the services provided by GCP, and stores its data within GCP. In order to fully leverage capabilities of IDC, you will need to activate GCP for your google account."
+        "IDC is built upon the services provided by GCP. Image files curated by IDC are available for download from either GCP or Amazon AWS buckets. \n",
+        "\n",
+        "In order to fully leverage capabilities of IDC, you will need to activate GCP for your google account."
       ]
     },
     {
@@ -124,7 +128,8 @@
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+        "id": "SJ29fuYyodXP",
+        "cellView": "form"
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       "outputs": [],
       "source": [