fix markdown headers

Author: hrodmn

tutorials/site-monitoring-hls.ipynb

@@ -5,7 +5,7 @@
    "id": "03323569-6c72-460e-83c7-7415812d4e85",
    "metadata": {},
    "source": [
-    "# Vegetation Monitoring with HLS Data on the Planetary Computer\n",
+    "## Vegetation Monitoring with HLS Data on the Planetary Computer\n",
     "\n",
     "<details>\n",
     "<summary> <b>📘 Outline</b> </summary>\n",
@@ -32,7 +32,7 @@
     "- [Site Monitoring Foundations](/tutorials/site-monitoring-foundatons.ipynb) (Beginner)\n",
     "\n",
     "\n",
-    "## Learning Objectives\n",
+    "### Learning Objectives\n",
     "\n",
     "By the end of this notebook, you should be able to:\n",
     "\n",
@@ -43,7 +43,7 @@
     "🔍 Identify periods of vegetation stress or disturbance  \n",
     "💾 Export results for use in dashboards or reports\n",
     "\n",
-    "## Core Concepts\n",
+    "### Core Concepts\n",
     "\n",
     "Before we begin, here are a few key concepts we'll use in this notebook:\n",
     "\n",