Update inventory file variable (#2693)

Add redis_mode to inventory variables

Doc Bug in RHAAP 2.5 RPM Installation

https://issues.redhat.com/browse/AAP-37501

Author: ianf77

downstream/modules/platform/ref-gateway-controller-ext-db.adoc

@@ -19,6 +19,7 @@ data.example.com
 
 [all:vars]
 admin_password='<password>'
+redis_mode=standalone
 pg_host='data.example.com'
 pg_port=5432
 pg_database='awx'

downstream/modules/platform/ref-gateway-controller-hub-eda-ext-db.adoc

@@ -37,6 +37,7 @@ data.example.com
 
 [all:vars]
 admin_password='<password>'
+redis_mode=standalone
 pg_host='data.example.com'
 pg_port='5432'
 pg_database='awx'

downstream/modules/platform/ref-gateway-controller-hub-ext-db.adoc

@@ -20,6 +20,7 @@ data.example.com
 
 [all:vars]
 admin_password='<password>'
+redis_mode=standalone
 pg_host='data.example.com'
 pg_port='5432'
 pg_database='awx'

downstream/modules/platform/ref-general-inventory-variables.adoc

@@ -63,6 +63,8 @@ Default = `ansible-automation-platform-25`
 Default = `rhel8`
 | `redis_mode` | | Redis can be colocated with {Gateway}, {HubName}, and {EDAcontroller} nodes. 
 
+Possible values are: `standalone` and `cluster`
+
 Default = cluster
 | `registry_password` |`registry_password` | This variable is only required if a non-bundle installer is used.