docs(changelog): move grid groupStrategy to new features section

Author: damyanpetev

CHANGELOG.md

@@ -50,6 +50,8 @@ All notable changes for each version of this project will be documented in this
     - Added `groupSortingDirection` input, which allows you to set groups sorting order.
 - `IgxGrid`, `IgxTreeGrid`, `IgxHierarchicalGrid`
     - Added new directives for re-templating header sorting indicators - `IgxSortHeaderIconDirective`, `IgxSortAscendingHeaderIconDirective` and `IgxSortDescendingHeaderIconDirective`.
+- `IgxGrid`
+    - Exposed a `groupStrategy` input that functions similarly to `sortStrategy`, allowing customization of the grouping behavior of the grid. Please, refer to the [Group By ](https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/groupby) topic for more information.
 - `IgxDialog`
     - Added `focusTrap` input to set whether the Tab key focus is trapped within the dialog when opened. Defaults to `true`.
 
@@ -101,8 +103,6 @@ All notable changes for each version of this project will be documented in this
         ```
     - `IgxColumnActionsComponent`
         - **Breaking Change** -  Input `columns` has been removed. Use `igxGrid` `columns` input instead.
-    - `igxGrid`
-    - Exposed a `groupStrategy` input that functions similarly to `sortStrategy`, allowing customization of the grouping behavior of the grid. Please, refer to the [Group By ](https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/groupby) topic for more information.
 - `IgxCarousel`
     - **Breaking Changes** - The carousel animation type `CarouselAnimationType` is renamed to `HorizontalAnimationType`.