Defender XDR - remove Sentinel docs from TOC.yml

Because we want to distinguish XDR from the Defender portal, I don’t think it makes sense to have the Sentinel docs link in the XDR TOC anymore.

Author: cwatson-cat

defender-xdr/TOC.yml

@@ -667,8 +667,6 @@
           href: virus-initiative-criteria.md
         - name: Software developer FAQ
           href: developer-faq.yml
-    - name: Microsoft Sentinel docs
-      href: /azure/sentinel
     - name: Microsoft Defender XDR docs
       items:
        - name: Defender for Office 365