doc: clarify optional sns region requirement (#81)

Author: iru

examples/organizational/variables.tf

@@ -31,7 +31,7 @@ variable "organizational_member_default_admin_role" {
 variable "cloudtrail_sns_arn" {
   type        = string
   default     = "create"
-  description = "ARN of a pre-existing cloudtrail_sns. Used together with `cloudtrail_sns_arn`, `cloudtrail_s3_arn`. If it does not exist, it will be inferred from created cloudtrail. Providing an ARN requires permisision to SNS:Subscribe, check ./modules/infrastructure/cloudtrail/sns_permissions.tf block"
+  description = "ARN of a pre-existing cloudtrail_sns. Used together with `cloudtrail_sns_arn`, `cloudtrail_s3_arn`. If it does not exist, it will be inferred from created cloudtrail. Providing an ARN requires permission to SNS:Subscribe, check ./modules/infrastructure/cloudtrail/sns_permissions.tf block"
 }
 
 variable "cloudtrail_s3_arn" {

examples/single-account-k8s/variables.tf

@@ -9,7 +9,7 @@
 variable "cloudtrail_sns_arn" {
   type        = string
   default     = "create"
-  description = "ARN of a pre-existing cloudtrail_sns. If it does not exist, it will be inferred from created cloudtrail"
+  description = "ARN of a pre-existing cloudtrail_sns. If defaulted, a new cloudtrail will be created. If specified, deployment region must match Cloudtrail S3 bucket region"
 }
 
 variable "cloudtrail_is_multi_region_trail" {

examples/single-account/variables.tf

@@ -11,7 +11,7 @@
 variable "cloudtrail_sns_arn" {
   type        = string
   default     = "create"
-  description = "ARN of a pre-existing cloudtrail_sns. If defaulted, a new cloudtrail will be created"
+  description = "ARN of a pre-existing cloudtrail_sns. If defaulted, a new cloudtrail will be created. If specified, deployment region must match Cloudtrail S3 bucket region"
 }
 
 variable "cloudtrail_is_multi_region_trail" {

modules/services/cloud-connector/variables.tf

@@ -39,7 +39,7 @@ variable "ecs_vpc_subnets_private_ids" {
 
 variable "sns_topic_arn" {
   type        = string
-  description = "ARN of a cloudtrail-sns topic"
+  description = "ARN of a cloudtrail-sns topic. If specified, deployment region must match Cloudtrail S3 bucket region"
 }