Update air-about.md

Author: chrisda

defender-office-365/air-about.md

@@ -79,7 +79,7 @@ In addition, make sure to review your organization's [alert policies](alert-poli
 
 ## Which alert policies trigger automated investigations?
 
-Microsoft 365 provides many built-in alert policies that help identify Exchange admin permissions abuse, malware activity, potential external and internal threats, and information governance risks. Several of the [default alert policies](/purview/alert-policies#default-alert-policies) can trigger automated investigations. If these alerts are disabled or replaced by custom alerts than AIR won't be triggered. 
+Microsoft 365 provides many built-in alert policies that help identify Exchange admin permissions abuse, malware activity, potential external and internal threats, and information governance risks. Several of the [default alert policies](/purview/alert-policies#default-alert-policies) can trigger automated investigations. If these alerts are disabled or replaced by custom alerts, AIR isn't triggered. 
 
 The following table describes the alerts that trigger automated investigations, their severity in the Microsoft Defender portal, and how they're generated: