add watermark title and fix citation

Author: farhanreynaldo

examples/generalized_linear_models/GLM-hierarchical-binomial-model.ipynb

@@ -880,11 +880,18 @@
    "source": [
     "## Authors\n",
     "\n",
-    "* Adapted from chapter 5 of Bayesian Data Analysis 3rd Edition {cite:p}gelman2013bayesian by Demetri Pananos and Junpeng Lao ([pymc#3054](https://github.com/pymc-devs/pymc/pull/3054))\n",
+    "* Adapted from chapter 5 of Bayesian Data Analysis 3rd Edition {cite:p}`gelman2013bayesian` by Demetri Pananos and Junpeng Lao ([pymc#3054](https://github.com/pymc-devs/pymc/pull/3054))\n",
     "* Updated and reexecuted by Raúl Maldonado ([pymc-examples#24](https://github.com/pymc-devs/pymc-examples/pull/24), [pymc-examples#45](https://github.com/pymc-devs/pymc-examples/pull/45) and [pymc-examples#147](https://github.com/pymc-devs/pymc-examples/pull/147))\n",
     "* Updated and reexecuted by Farhan Reynaldo in November 2021 ([pymc-examples#248](https://github.com/pymc-devs/pymc-examples/pull/248))"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Watermark"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 14,