message: add Element#textGuideLineConfig.showAbove defnintion.
diff: @@ -167,6 +167,11 @@ export interface ElementTextGuideLineConfig {
  */
  anchor?: Point
  + /**
  + * If above the target element.
  + */
  + showAbove?: boolean
  +
  /**
  * Candidates of connectors. Used when autoCalculate is true and anchor is not specified.
  */
  