List: update showSelectionControls (DevExpress#7009) (DevExpress#7010)

Author: vladaskorohodova

api-reference/10 UI Components/dxList/1 Configuration/showSelectionControls.md

@@ -5,7 +5,7 @@ default: false
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 ##### shortDescription
-Specifies whether or not to display controls used to select list items.
+Specifies whether or not to display controls used to select list items. Not available if [selectionMode](/Documentation/ApiReference/UI_Components/dxList/Configuration/#selectionMode) is set to *'none'*.
 
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 #include btn-open-demo with {