update TOC

Author: DebLanger

unified-secops-platform/TOC.yml

@@ -43,8 +43,12 @@
         href: overview-deploy.md
       - name: Connect Microsoft Sentinel to Microsoft Defender
         href: microsoft-sentinel-onboard.md
-    - name: Reduce security risk
-      href: reduce-risk-overview.md
+    - name: Secure
+      items:
+      - name: Reduce security risk
+        href: reduce-risk-overview.md
+      - name: Protect your environment
+        href: overview-msem-strategy.md  
     - name: Detect threats
       href: detect-threats-overview.md
     - name: Uncover adversaries with threat intel