Grids: Update focus() description (#7955) (#7970)

Author: arman-boyakhchyan

api-reference/10 UI Components/dxDataGrid/3 Methods/focus().md

@@ -0,0 +1,28 @@
+---
+##### shortDescription
+Sets focus on the UI component.
+
+---
+The focused {WidgetName} element depends on the following conditions:
+
+<table class="dx-table">
+    <tr>
+        <th>Condition</th>
+        <th>Focused element</th>
+    </tr>
+    <tr>
+        <td><a href="/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/#focusedRowEnabled">focusedRowEnabled</a> is set to <code>true</code>.</td>
+        <td>Focuses the first {WidgetName} row.</td>
+    </tr>
+    <tr>
+        <td><b>focusedRowEnabled</b> is set to <code>false</code>.</td>
+        <td>Focuses the first cell in the data area.</td>
+    </tr>
+    <tr>
+        <td><a href="/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/grouping/">Grouping</a> is configured.</td>
+        <td>Focuses the first group header.</td>
+    </tr>
+</table>
+
+#####See Also#####
+#include common-link-callmethods

api-reference/10 UI Components/dxTreeList/3 Methods/focus().md

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+---
+##### shortDescription
+Sets focus on the UI component.
+
+---
+This method focuses a {WidgetName} element depending on the following conditions:
+
+<table class="dx-table">
+    <tr>
+        <th>Condition</th>
+        <th>Focused element</th>
+    </tr>
+    <tr>
+        <td><a href="/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/#focusedRowEnabled">focusedRowEnabled</a> is set to <code>true</code>.</td>
+        <td>Focuses the first {WidgetName} row.</td>
+    </tr>
+    <tr>
+        <td><b>focusedRowEnabled</b> is set to <code>false</code>.</td>
+        <td>Focuses the first cell in the data area.</td>
+    </tr>
+    <tr>
+        <td><a href="/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/grouping/">Grouping</a> is configured.</td>
+        <td>Focuses the first group header.</td>
+    </tr>
+</table>
+
+#####See Also#####
+#include common-link-callmethods