Chart: Update Funnel Chart demo description (DevExpress#30689) (DevExpress#30694)

Author: arman-boyakhchyan

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

@@ -1,6 +1,20 @@
-The DevExtreme JavaScript Funnel Chart visualizes a value at different stages. It helps assess value changes throughout these stages and identify potential issues. In this demo, the Funnel shows the percentage of website users that performed a certain action: downloaded a trial, contacted support, purchased a subscription, etc. The chart shows that most users decided not to subscribe after contacting support. You can use this information to make a decision, for example, to provide extra training for the support team.
+DevExtreme Funnel displays data in a funnel chart. You can implement funnel charts to display the flow of data over different stages. This demo displays conversion rates from website visits to product renewals.
+
 <!--split-->
 
+This demo specifies multiple Funnel configuration objects:
+
+- [title](/Documentation/ApiReference/UI_Components/dxFunnel/Configuration/title/)    
+Specifies a title for the Funnel component.
+- [export](/Documentation/ApiReference/UI_Components/dxFunnel/Configuration/export/)    
+Configures export settings. Funnel supports multiple export [formats](/Documentation/ApiReference/UI_Components/dxFunnel/Configuration/export/#formats).
+- [tooltip](/Documentation/ApiReference/UI_Components/dxFunnel/Configuration/tooltip/)    
+Specifies item tooltips.
+- [label](/Documentation/ApiReference/UI_Components/dxFunnel/Configuration/label/)    
+Configures item labels.
+- [item](/Documentation/ApiReference/UI_Components/dxFunnel/Configuration/item/)    
+Customizes the visual appearance of items.
+
 [note]
 
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