add title to code

Author: khuyentran1401

Chapter5/spark.ipynb

@@ -8,6 +8,14 @@
     "## PySpark"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "8edc16c3",
+   "metadata": {},
+   "source": [
+    "### Distributed Data Joining with Shuffle Joins in PySpark"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -2229,7 +2237,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.6"
+   "version": "3.11.4"
   }
  },
  "nbformat": 4,