Updated TOC entries

Author: AbbyMSFT

ATPDocs/toc.yml

@@ -146,7 +146,7 @@ items:
         href: alerts-overview.md
       - name: Defender for Identity classic alerts
         href: alerts-mdi-classic.md
-      - name: Microsoft Defender XDR alerts
+      - name: Defender for Identity XDR alerts
         href: alerts-xdr.md
       - name: View and manage security alerts
         href: understanding-security-alerts.md