Fix a broken link in IS2_data_access.ipynb (#456)

doc/source/example_notebooks/IS2_data_access.ipynb

@@ -79,7 +79,7 @@
     "\n",
     "There are three required inputs, depending on how you want to search for data. Two are required in all cases:\n",
     "- `short_name` = the data product of interest, known as its \"short name\".\n",
-    "See https://nsidc.org/data/icesat-2/data-sets for a list of the available data products.\n",
+    "See https://nsidc.org/data/icesat-2/products for a list of the available data products.\n",
     "- `spatial extent` = a region of interest to search within. This can be entered as a bounding box, polygon vertex coordinate pairs, or a polygon geospatial file (currently shp, kml, and gpkg are supported).\n",
     "    - bounding box: Given in decimal degrees for the lower left longitude, lower left latitude, upper right longitude, and upper right latitude\n",
     "    - polygon vertices: Given as longitude, latitude coordinate pairs of decimal degrees with the last entry a repeat of the first.\n",