adding title for search

Author: Ziqun Ye

llm_application/Use_of_Cohere_embed_models_for_Semantic_Search_in_OCI_OpenSearch.ipynb

@@ -254,7 +254,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "\n",
+    "### Step 5: Semantic Search\n",
     "A new query coming in, first calcualte the embedding vector and then conduct a semantic search.\n",
     "\n",
     "- `k`: the number of neighbors the search will return\n",