Revert "Update tutorials/02-Calcium Imaging Imported Tables.ipynb"

This reverts commit 81528d5.

Author: kushalbakshi

tutorials/02-Calcium Imaging Imported Tables.ipynb

@@ -23,7 +23,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "First thing first, let's import `datajoint` again."
+    "## Importing libraries"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "First thing first, let's import `DataJoint` again."
    ]
   },
   {