Added TOC entry for Skill up

Author: laghim

articles/sentinel/TOC.yml

@@ -534,11 +534,13 @@
     href: https://azure.microsoft.com/pricing/details/azure-sentinel/
   - name: Feature availability for US Government clouds
     href: ../security/fundamentals/feature-availability.md
-  - name: Build your skills with Microsoft Learn training
+  - name: Build your skills for Microsoft Sentinel
     items: 
-    - name: Microsoft Sentinel training 
+      name: Microsoft Sentinel skill-up training  
+      href: skill-up-resources.md
+    - name: Microsoft Learn modules for Microsoft Sentinel
       href: /learn/browse/?expanded=azure&products=azure-sentinel
-    - name: Kusto Query Language (KQL) training 
+    - name: Microsoft Learn modules for Kusto Query Language (KQL)
       href: /learn/browse/?expanded=azure&terms=kusto%20query%20language
   - name: Archived what's new (older than six months)
     href: whats-new-archive.md