update tutorials/pretraining-Vietnamese-data-curation according to Ry…

…an Wolf's comments

Signed-off-by: hoangphu7122002 <hoangphu7122002ai@gmail.com>

tutorials/pretraining-Vietnamese-data-curation/pretraining-Vietnamese-data-curation.ipynb

@@ -16,6 +16,21 @@
     "In this tutorial, we will use NeMo Curator to process high-quality [Vietnamese data](https://huggingface.co/datasets/VTSNLP/vietnamese_curated_dataset). We will guide you through the data curation pipeline used and share sample code for each stage."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Table of Contents\n",
+    "- **1. [Prerequisites and Environment setups](#prerequisites-and-environment-setups)**\n",
+    "- **2. [Data Collecting](#data-collecting)**\n",
+    "- **3. [Data Curation flow](#data-curation-flow)**\n",
+    "    - a. [Unicode reformatting](#unicode-reformatting)\n",
+    "    - b. [Adding Custom IDs to Documents](#adding-custom-ids-to-documents)\n",
+    "    - c. [Exact deduplication](#exact-deduplication)\n",
+    "    - d. [Heuristic Quality Filtering](#heuristic-quality-filtering)\n",
+    "    - e. [Classifier-based Quality Filtering](#classifier-based-quality-filtering)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},