message: refined some wording and added a comment on the usererrors metric
diff: @@ -96,7 +96,10 @@ export class TheCloudwatchDashboardStack extends cdk.Stack {
  period: cdk.Duration.minutes(5)
  });
  - // Rather than have 2 alerts, let's create one aggregate metric
  + // I think usererrors are at an account level rather than a table level so merging
  + // these two metrics until I can get a definitive answer. I think usererrors
  + // will always show as 0 when scoped to a table so this is still effectively
  + // a system errors count
  let dynamoDBTotalErrors = new cloudwatch.MathExpression({
  expression: 'm1 + m2',
  label: 'DynamoDB Errors',
  @@ -235,10 +238,8 @@ export class TheCloudwatchDashboardStack extends cdk.Stack {
  table.metricSuccessfulRequestLatency({dimensions: {"TableName":table.tableName, "Operation": "DeleteItem"}}),
  table.metricSuccessfulRequestLatency({dimensions: {"TableName":table.tableName, "Operation": "Query"}}),
  ], true),
  - this.buildGraphWidget('DynamoDB Consumed Read/Write Capacity', [
  - table.metric('ProvisionedReadCapacityUnits'),
  + this.buildGraphWidget('DynamoDB Consumed Read/Write Units', [
  table.metric('ConsumedReadCapacityUnits'),
  - table.metric('ProvisionedWriteCapacityUnits'),
  table.metric('ConsumedWriteCapacityUnits')
  ], false),
  this.buildGraphWidget('DynamoDB Throttles', [
  