add note to usage quickstart about lazy eval

docs/usage/quickstart.ipynb

@@ -1776,7 +1776,7 @@
    "id": "d292b4d3-e72b-48e7-92b8-7bb8994012c1",
    "metadata": {},
    "source": [
-    "Now that we have our data, we can do our \"analysis\", which here is to simply plot the timeseries."
+    "Now that we have our datasets, we can do our \"analysis\", which here is to simply plot the timeseries. Note that at this point, we still haven't actually loaded any product data into memory. Our datasets are [dask-backed xarray Dataset objects](https://docs.xarray.dev/en/stable/user-guide/dask.html#parallel-computing-with-dask) that will only be evaluated when required (or computed explicitly), for example when we try to plot our data:"
    ]
   },
   {
@@ -4280,9 +4280,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python (access-nri-intake-test)",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
-   "name": "access-nri-intake-test"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {