System - High Availability: explain "Disable preempt" and explain "Automatic failover" a bit better (settings page, versus functionality)

source/manual/hacarp.rst

@@ -71,12 +71,12 @@ Settings
 Automatic failover
 ............................
 
-If the primary firewall becomes unavailable, the secondary firewall will take
-over without user intervention and minimal interruption.
+Although not really a setting on the high availability setup page, it's a crucial part of high available setups.
+Using CARP type virtual addresses, the secondary firewall will take over without user intervention and minimal
+interruption when the primary becomes unavailable.
 
 Virtual IPs of the type CARP (:doc:`/manual/firewall_vip`) are required for this feature.
 
-
 ............................
 Synchronized state tables
 ............................
@@ -85,6 +85,14 @@ The firewall’s state table is replicated to all failover configured firewalls.
 This means the existing connections will be maintained in case of a failure,
 which is important to prevent network disruptions.
 
+............................
+Disable preempt
+............................
+
+By default this option is deselected, which is the advised scenario for most common HA setups.
+The preempt option make sure that multiple carp interfaces will act as a group (all :code:`backup` or :code:`master`)
+at the same time, assuming no technical issues exist between both.
+
 .................................
 Configuration synchronization
 .................................