fixed broken link

Author: yelevin

defender-xdr/TOC.yml

@@ -151,7 +151,7 @@
                  - name: Incidents
                    href: investigate-incidents.md
                  - name: Unlink alerts from incidents
-                   href: unlink-alerts-from-incidents.md
+                   href: unlink-alert-from-incident.md
                  - name: Investigate data loss prevention alerts with Microsoft Defender XDR
                    href: dlp-investigate-alerts-defender.md
                  - name: Investigate data loss prevention alerts with Microsoft Sentinel