Fix missing link (#503)

* fix: missing doc link

* fix: ref

docs/source/api/linalg/xgi.linalg.laplacian_matrix.rst

@@ -8,4 +8,5 @@ xgi.linalg.laplacian_matrix
    .. rubric:: Functions
 
    .. autofunction:: laplacian
+   .. autofunction:: multiorder_laplacian
    .. autofunction:: normalized_hypergraph_laplacian

docs/source/api/tutorials/case_study_zhang2022.ipynb

@@ -1,7 +1,6 @@
 {
  "cells": [
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "417f4911",
    "metadata": {},
@@ -15,9 +14,9 @@
    "metadata": {},
    "source": [
     "Here, using XGI, we reproduce figures 1 and 2 of the paper  \n",
-    "\"Do higher-order interactions promote synchronization?\"  \n",
+    "\"Higher-order interactions shape collective dynamics differently in hypergraphs and simplicial complexes\"  \n",
     "Yuanzhao Zhang *, Maxime Lucas *, Federico Battiston  \n",
-    "[arXiv:2203.03060](https://doi.org/10.48550/arXiv.2203.03060)"
+    "[Nature Communications, 14(1), 2023, p.1605](https://doi.org/10.1038/s41467-023-37190-9)"
    ]
   },
   {
@@ -468,7 +467,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3.10.6 ('venv': venv)",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -482,7 +481,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.9.18"
   },
   "toc": {
    "base_numbering": 1,