Mention availability of IP exception list for maintenance mode in GHES 3.4 docs (#37260)

Author: mattpollard

content/admin/configuration/configuring-your-enterprise/enabling-and-scheduling-maintenance-mode.md

@@ -56,6 +56,16 @@ You can perform initial validation of your maintenance operation by configuring
 
 ## Validating changes in maintenance mode using the IP exception list
 
+{% ifversion ghes = 3.4 %}
+
+{% note %}
+
+**Note**: To validate changes in maintenance mode using the IP exception list, your {% data variables.product.product_name %} instance must be running version 3.4.4 or later.
+
+{% endnote %}
+
+{% endif %}
+
 The IP exception list provides controlled and restricted access to {% data variables.location.product_location %}, which is ideal for initial validation of server health following a maintenance operation. Once enabled, {% data variables.location.product_location %} will be taken out of maintenance mode and available only to the configured IP addresses. The maintenance mode checkbox will be updated to reflect the change in state.
 
 If you re-enable maintenance mode, the IP exception list will be disabled and {% data variables.location.product_location %} will return to maintenance mode. If you just disable the IP exception list, {% data variables.location.product_location %} will return to normal operation.

data/features/ip-exception-list.yml

@@ -1,2 +1,2 @@
 versions:
-  ghes: '>=3.5'
+  ghes: '>=3.4'