Fix heading styling

Author: kushalbakshi

notebooks/tutorial.ipynb

@@ -2015,7 +2015,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### **Step 3: Run the Clustering Task**\n",
+    "### **Run the Clustering Task**\n",
     "\n",
     "We're almost ready to spike sort the data with `kilosort`. An important step before\n",
     "processing is managing the parameters which will be used in that step. To do so, we will\n",