docs: Shorter sidebar title for example (#922)

Closes #900

<img width="909" height="363" alt="image"
src="https://github.com/user-attachments/assets/28f4c0df-a9eb-4904-9e0b-1e1e4022a020"
/>

Author: kylebarron

examples/overture-geoparquet.ipynb

@@ -31,7 +31,9 @@
    "id": "250a25da-9547-4a0a-b709-8659e0669545",
    "metadata": {},
    "source": [
-    "# Visualizing Spatially-Partitioned GeoParquet with Lonboard, Obstore & GeoArrow-Rust\n",
+    "# Spatially-Partitioned GeoParquet\n",
+    "\n",
+    "## Visualizing Spatially-Partitioned GeoParquet with Lonboard, Obstore & GeoArrow-Rust\n",
     "\n",
     "[GeoParquet](https://geoparquet.org/) is a fast, cloud-native file format for geospatial vector data. There's a lot of excitement around _spatially-partitioned_ GeoParquet, where the data within one or more GeoParquet files is arranged spatially. This allows GeoParquet readers to select data from a spatial query without loading and parsing the entire dataset.\n",
     "\n",
@@ -538,9 +540,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "lonboard",
+   "display_name": ".venv",
    "language": "python",
-   "name": "lonboard"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {