TreeView: describe KBN limitations (DevExpress#6869) (DevExpress#6878)

Author: vladaskorohodova

api-reference/10 UI Components/dxTreeView/1 Configuration/selectByClick.md

@@ -8,6 +8,8 @@ default: false
 Specifies whether an item is selected if a user clicks it.
 
 ---
+Enable this property to select items with the Enter key when [selectionMode](/Documentation/ApiReference/UI_Components/dxTreeView/Configuration/#selectionMode) is set to *'none'*.
+
 #include btn-open-demo with {
     href: "https://js.devexpress.com/Demos/WidgetsGallery/Demo/TreeView/ItemSelectionAndCustomization/"
 }

concepts/05 UI Components/TreeView/03 Accessibility/15 Keyboard Navigation.md

@@ -39,16 +39,22 @@ A user can use the following keys to interact with the TreeView component:
     </tr>
     <tr>
         <td>Shift + &uarr; / Shift + &darr;</td>
-        <td>Extends selection up/down by one node.</td>
+        <td>Extends selection up/down by one node.<sup>1</sup></td>
     </tr>
     <tr>
         <td>Shift + Home</td>
-        <td>Extends selection up to the first node.</td>
+        <td>Extends selection up to the first node.<sup>1</sup></td>
     </tr>
     <tr>
         <td>Shift + End</td>
-        <td>Extends selection down to the last node.</td>
+        <td>Extends selection down to the last node.<sup>1</sup></td>
     </tr>
 </table>
 
+<div class="footnotes">
+    <ol>
+        <li>If <a href="/Documentation/ApiReference/UI_Components/dxTreeView/Configuration/#showCheckBoxesMode">showCheckBoxesMode</a> is set to <i>"none"</i>, this action has no effect.</li>
+    </ol>
+</div>
+
 #include common-code-register-key-handler