Revert "Update tutorials/01-DataJoint Basics.ipynb"

This reverts commit 6329582.

Author: kushalbakshi

tutorials/01-DataJoint Basics.ipynb

@@ -551,7 +551,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Note that, to uniquely identify an experimental session (or simply a `Session`), we need to know the mouse that the session was about. In other words, a session cannot existing without a corresponding mouse! \n",
+    "Note that to uniquely identify an experimental session (or simply a **session**), we need to know the mouse used in that the session. In other words, a session cannot exist without a corresponding mouse! \n",
     "\n",
     "With `Mouse` already represented as a table in our pipeline, we say that the session **depends on** the mouse! We could graphically represent this in an **entity relationship diagram (ERD)** by drawing the line between two tables, with the one below (`Session`) depending on the one above (`Mouse`)."
    ]