Sentinel - Update TOC.yml

Fix bc link for connect SEntinel to XDR title

Author: cwatson-cat

articles/sentinel/TOC.yml

@@ -1190,7 +1190,7 @@
     - name: Auxiliary logs use cases
       href: basic-logs-use-cases.md
   - name: Connect Microsoft Sentinel to Microsoft Defender XDR
-    href: /defender-xdr/microsoft-sentinel-onboard??toc=/azure/sentinel/TOC.json&bc=/azure/sentinel/breadcrumb/toc.json
+    href: /defender-xdr/microsoft-sentinel-onboard?toc=/azure/sentinel/TOC.json&bc=/azure/sentinel/breadcrumb/toc.json
   - name: Manage multiple workspaces 
     items:
     - name: Workspace manager