Update TOC.yml

Author: vpattnai

defender-xdr/TOC.yml

@@ -418,6 +418,10 @@
                   href: access-den-graph-api.md
                 - name: Ask Defender Experts
                   href: experts-on-demand.md
+              - name: Frequently asked questions
+                items:
+              - name: General information
+                href: faq-defender-experts-hunting.md    
               - name: Understand Defender Experts for Hunting reports
                 href: defender-experts-report.md
        - name: Collaborate with Microsoft Defender Experts for XDR