Chart: Update Pareto Chart demo description (DevExpress#30665) (DevExpress#30671)

Author: arman-boyakhchyan

apps/demos/Demos/Charts/ParetoChart/description.md

@@ -1,3 +1,5 @@
-In this demo, the DevExtreme Chart component is used to create a [Pareto chart][0]. This example of a Pareto chart summarizes complaints about the service provided by a pizza shop. From this chart, the pizza shop owner may infer that to satisfy most of the customers, he or she needs to eliminate two most frequently encountered issues: delayed delivery and cold pizza.
+You can utilize the DevExtreme Chart component to display data in a [Pareto chart](https://en.wikipedia.org/wiki/Pareto_chart). A Pareto chart displays individual values along with their cumulative totals. In this demo, individual values are numbers of complaints and cumulative totals are represented as percentages.
 
-[0]: https://en.wikipedia.org/wiki/Pareto_chart
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+To create a Pareto chart, configure two [series](/Documentation/ApiReference/UI_Components/dxChart/Configuration/series/) objects. Assign the [Bar](/Documentation/ApiReference/UI_Components/dxChart/Series_Types/BarSeries/) and [Line](/Documentation/ApiReference/UI_Components/dxChart/Series_Types/LineSeries/)/[Spline](/Documentation/ApiReference/UI_Components/dxChart/Series_Types/SplineSeries/) series types to **series**.[type](/Documentation/ApiReference/UI_Components/dxChart/Configuration/series/#type). To represent the numbers of the [Pareto principle](https://en.wikipedia.org/wiki/Pareto_principle) (80/20), you can specify constant lines. This demo configures a **valueAxis**.[constantLines](/Documentation/ApiReference/UI_Components/dxChart/Configuration/valueAxis/constantLines/) object to display a constant line at 80% of the cumulative total axis.