[update] what's new for v9.2, complete grid index page

Author: mafanya23

docs/grid/index.md

@@ -28,17 +28,24 @@ You can check the following page to learn how to build a full-featured DHTMLX Gr
 - To get the whole JavaScript library of UI components [download DHTMLX Suite](https://dhtmlx.com/docs/products/dhtmlxSuite/download.shtml)
 - There are also [online samples for DHTMLX Grid](https://snippet.dhtmlx.com/1mxmshax?tag=grid)
 - To work with data of Grid check [DataCollection API](data_collection.md)
+- To work with data of Grid in the TreeGrid mode check [TreeCollection API](tree_collection.md)
 
 ## Guides
 
 Says how to build a standard grid on a page and bring it to life: configure with specific settings, customize the appearance, attach events, etc.
 
 - [](grid/initialization.md)
 - [](grid/configuration.md)
+- [](grid/localization.md)
 - [](grid/data_loading.md)
 - [](grid/usage.md)
 - [](grid/treegrid_mode.md) 
 - [](grid/usage_selection.md)
+- [](grid/usage_rangeselection.md)
+- [](grid/usage_blockselection.md)
+- [](grid/usage_clipboard.md)
+- [](grid/usage_dragpanel.md)
+- [](grid/usage_history.md)
 - [](grid/customization.md)
 - [](grid/events.md)
 

docs/whatsnew.md

@@ -50,9 +50,10 @@ Released on June X, 2025
 - DragManager. The issue associated with the absence or incorrect definition of the drop position for the default mode
 - DragManager. The issue with the `dragIn` event (the previous reset state was transmitted)
 - DragManager. The `dragIn/dragOut` events are optimized (false positives are removed)
-- Grid. The issue with falsy selection of frozen cells while selecting unfrozen cells
+- Grid. The issue with falsy selection of fixed cells while selecting unfrozen cells
 - Grid. The issue with dragging unselected items
 - Grid. Sorting of the Date string (ISO) values results in the invalid format error
+- Grid. Export. Grid. Double quotes in the cell value are escaped in the exported Excel
 
 ### New samples