docs(grid): update changelog #4356

CHANGELOG.md

@@ -17,6 +17,14 @@ All notable changes for each version of this project will be documented in this
 - `IgxGrid`, `IgxTreeGrid`, `IgxHierarchicalGrid`
     - **Behavioral Change** - Pinning columns is no longer automatically prevented when the pinning area would exceed the size of the grid.
 
+### New Features
+- `IgxGrid`, `IgxTreeGrid`, `IgxHierarchicalGrid`
+    - `sortStrategy` input is added, which can be used to set a global sorting strategy for the entire grid.
+        (**NOTE**: The grid's `sortStrategy` is of different type compared to the column's `sortStrategy`.)
+    - `NoopSortingStrategy` is added, which can be used to disable the default sorting of the grid by assigning its instance to the grid's `sortStrategy` input. (Useful for remote sorting.)
+    - `NoopFilteringStrategy` is added, which can be used to disable the default filtering of the grid by assigning its instance to the grid's `filterStrategy` input. (Useful for remote filtering.)
+    - `sortingExpressionsChange` event emitter is added, which is fired whenever a change to the UI sorting has occurred (prior to performing the actual sorting).
+    - `filteringExpressionsTreeChange` event emitter is added, which is fired whenever a change to the UI filtering has occurred (prior to performing the actual filtering).
 
 ## 8.2.6