docs(grid): Filterable param for column in filtering article

Author: marin-bratanov

components/grid/filtering.md

@@ -31,6 +31,8 @@ The behavior of the filter input and the available filter operators will depend
 
 You can filter more than one column at a time, and all filter rules will be applied together with an `AND` logic.
 
+You can prevent the user from filtering a certain field by setting `Filterable="false"` on its column.
+
 ## Filter Row
 
 To enable the filter row set the `FilterMode` property of the grid to `Telerik.Blazor.GridFilterMode.FilterRow`.

components/grid/sorting.md

@@ -24,7 +24,7 @@ To enable sorting, set the grid's `Sortable` property to `true`.
 
 When the user clicks the column header, the grid will sort the data according to the column's data type, and an arrow indicator of the sorting direction will be shown next to the column title.
 
-To prevent the user from sorting a certain field by setting `Sortable="false"` on its column.
+You can prevent the user from sorting a certain field by setting `Sortable="false"` on its column.
 
 >caption Enable Sorting in Telerik Grid