fixes to documentation

Author: rajeeja

docs/user-guide/divergence.ipynb

@@ -233,9 +233,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "uxarray_env3.12",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
-   "name": "uxarray_env3.12"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {

docs/userguide.rst

@@ -70,6 +70,9 @@ These user guides provide detailed explanations of the core functionality in UXa
 `Gradients <user-guide/gradients.ipynb>`_
  Compute the gradient of a data variable
 
+`Divergence <user-guide/divergence.ipynb>`_
+ Compute the divergence of a vector field
+
 `Tree Structures <user-guide/tree_structures.ipynb>`_
  Data structures for nearest neighbor queries
 
@@ -118,6 +121,7 @@ These user guides provide additional details about specific features in UXarray.
    user-guide/topological-aggregations.ipynb
    user-guide/weighted_mean.ipynb
    user-guide/gradients.ipynb
+   user-guide/divergence.ipynb
    user-guide/tree_structures.ipynb
    user-guide/area_calc.ipynb
    user-guide/dual-mesh.ipynb