Directions referring to appending .<region> to CreateTemplateURLPrefix and LambdaS3BucketNamePrefix appear to be unnecessary and confusing

[stephen-leavitt-sonymusicpub-com]

The parameters CreateTemplateURLPrefix and LambdaS3BucketNamePrefix have descriptions that seem to direct the user to append . to the end of them. In both cases, the CloudFormation template is already appending AWS::Region to them, so if the user specifies this manually as well, it leads to buckets not being found.

cwl-s3-export.template:282

        "StackCreateCloudWatchLogExport": {
            "Type": "AWS::CloudFormation::Stack",
            "Properties": {
                "Parameters": {
                    "CloudWatchLogGroup": {"Ref": "CloudWatchLogGroup"},
                    "KinesisShards": {"Ref": "KinesisShards"},
                    "LogFormat": {"Ref": "LogFormat"},
                    "SubscriptionFilterPattern": {"Ref": "SubscriptionFilterPattern"},
                    "S3BucketName": {"Ref": "S3BucketName"},
                    "S3LogFolderName": {"Ref": "S3LogFolderName"},
                    "LambdaS3BucketNamePrefix": {"Ref": "LambdaS3BucketNamePrefix"},
                    "LambdaPackageName": {"Ref": "LambdaPackageName"},
                    "AlertLogicAWSAccountId": {"Ref": "AlertLogicAWSAccountId"},
                    "AlertLogicPublicApiKey": {"Ref": "AlertLogicPublicApiKey"},
                    "AlertLogicAccountId": {"Ref": "AlertLogicAccountId"},
                    "DestinationArn": {
                        "Fn::GetAtt": [
                            "CloudWatchLogGroupInfo",
                            "destinationArn"
                        ]
                    }
                },
                "TemplateURL": {
                    "Fn::Join": [
                        "",
                        [
                            {
                                "Ref": "CreateTemplateURLPrefix"
                            },
                            ".",
                            {
                                "Ref": "AWS::Region"
                            },
                            "/templates/create-cwl-s3-export.template"
                        ]
                    ]
                },
                "TimeoutInMinutes": "10"
            }
        }

create-cwl-s3-export.template:355 (Note that LambdaS3BucketNamePrefix is not used, that alertlogic-public-repo. is hard-wired as part of the prefix, with the AWS::Region appended to it).

        "CreateLambdaS3ExportWorkerFunction": {
            "Type": "AWS::Lambda::Function",
            "Properties": {
                "Handler": "index.handler",
                "Description": "CloudWatch Logs export to S3 function.",
                "Role": {
                    "Fn::GetAtt": [
                        "LambdaS3ExportWorkerRole",
                        "Arn"
                    ]
                },
                "Code": {
                    "S3Bucket": {
                        "Fn::Join": [
                            "",
                            [
                                "alertlogic-public-repo.",
                                {
                                    "Ref": "AWS::Region"
                                }
                            ]
                        ]
                    },
                    "S3Key": {
                        "Ref": "LambdaPackageName"
                    }
                },
                "Runtime": "nodejs8.10",
                "Timeout": "300"
            },
            "DependsOn": [
                "LambdaS3ExportWorkerPolicy"
            ]
        },

Recommend updating CreateLambdaS3ExportWorkerFunction to use LambdaS3BucketNamePrefix instead of hard-wiring alertlogic-public-repo., and removing instructions from the parameter descriptions directing the user to append . to the end of CreateTemplateURLPrefix and LambdaS3BucketNamePrefix if the current AWS region is going to be automatically appended by the CloudFormation template anyways.