Add ref to US bbox

Added line of text to refer to region of interest.

notebooks/SearchDownload_SWOTviaCMR.ipynb

@@ -70,7 +70,9 @@
    "metadata": {},
    "source": [
     "### Search for SWOT sample data links\n",
-    "We want to find the SWOT sample files that will cross over our region of interest. Each dataset has it's own unique collection ID. For the SWOT_SIMULATED_NA_CONTINENT_L2_HR_RIVERSP_V1 dataset, we find the collection ID [here](https://podaac.jpl.nasa.gov/dataset/SWOT_SIMULATED_NA_CONTINENT_L2_HR_RIVERSP_V1).\n",
+    "We want to find the SWOT sample files that will cross over our region of interest, in the case, a bounding box of the United States. \n",
+    "\n",
+    "Each dataset has it's own unique collection ID. For the SWOT_SIMULATED_NA_CONTINENT_L2_HR_RIVERSP_V1 dataset, we find the collection ID [here](https://podaac.jpl.nasa.gov/dataset/SWOT_SIMULATED_NA_CONTINENT_L2_HR_RIVERSP_V1).\n",
     "\n",
     "**Sample SWOT Hydrology Datasets and Associated Collection IDs:**\n",
     "1. **River Vector Shapefile** - SWOT_SIMULATED_NA_CONTINENT_L2_HR_RIVERSP_V1 - **C2263384307-POCLOUD**\n",
@@ -481,7 +483,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.9"
+   "version": "3.8.13"
   },
   "vscode": {
    "interpreter": {