Fix typo in tutorial heading

Author: kushalbakshi

notebooks/tutorial.ipynb

@@ -5,7 +5,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# DataJoint Element Tutorial: Array Electrophysiology\n",
+    "# DataJoint Elements Tutorial: Array Electrophysiology\n",
     "\n",
     "Welcome to the tutorial for DataJoint's open-source data pipeline for NeuroPixels Array\n",
     "Electrophysiology. This tutorial aims to provide a comprehensive understanding of the\n",