docs(api): Update Server API for R2 2021 release

Author: pepinho24

Diff for: api/server/Telerik.Web.UI.Gantt/TasksTooltip.md

@@ -0,0 +1,26 @@
+---
+title: Telerik.Web.UI.Gantt.TasksTooltip
+page_title: Telerik.Web.UI.Gantt.TasksTooltip
+description: Telerik.Web.UI.Gantt.TasksTooltip
+---
+
+# Telerik.Web.UI.Gantt.TasksTooltip
+
+The default Kendo UI Tooltip options for all marker layers.
+
+## Inheritance Hierarchy
+
+* System.Object
+* Telerik.Web.StateManager : IMarkableStateManager, IStateManager
+* Telerik.Web.UI.Gantt.TasksTooltip : IDefaultCheck
+
+## Properties
+
+###  ClientTemplate `String`
+
+The template which renders the tooltip.The fields which can be used in the template are: task - the gantt task, for which the template is shown.
+
+###  Visible `Boolean`
+
+If set to false the gantt will not display the task tooltip. By default the task tooltip is displayed.
+

Diff for: api/server/Telerik.Web.UI.Gantt/TasksTooltipConverter.md

@@ -0,0 +1,41 @@
+---
+title: Telerik.Web.UI.Gantt.TasksTooltipConverter
+page_title: Telerik.Web.UI.Gantt.TasksTooltipConverter
+description: Telerik.Web.UI.Gantt.TasksTooltipConverter
+---
+
+# Telerik.Web.UI.Gantt.TasksTooltipConverter
+
+Serialization JS converter class for Tooltip
+
+## Inheritance Hierarchy
+
+* System.Object
+* System.Web.Script.Serialization.JavaScriptConverter
+* Telerik.Web.UI.ExplicitJavaScriptConverter
+* Telerik.Web.UI.Gantt.TasksTooltipConverter
+
+## Methods
+
+###  AddScript
+
+Serialize the value as a script, not a string. Should be used alongside with
+
+#### Parameters
+
+#### state `System.Collections.Generic.IDictionary{System.String,System.Object}`
+
+The state collection for the values
+
+#### key `System.String`
+
+The key in the JSON object
+
+#### value `System.Object`
+
+The value in the JSON obejct
+
+#### Returns
+
+`System.Void` 
+

Diff for: api/server/Telerik.Web.UI/GanttToolbarItemConverter.md

@@ -0,0 +1,41 @@
+---
+title: Telerik.Web.UI.GanttToolbarItemConverter
+page_title: Telerik.Web.UI.GanttToolbarItemConverter
+description: Telerik.Web.UI.GanttToolbarItemConverter
+---
+
+# Telerik.Web.UI.GanttToolbarItemConverter
+
+Serialization JS converter class for GanttToolbarItem
+
+## Inheritance Hierarchy
+
+* System.Object
+* System.Web.Script.Serialization.JavaScriptConverter
+* Telerik.Web.UI.ExplicitJavaScriptConverter
+* Telerik.Web.UI.GanttToolbarItemConverter
+
+## Methods
+
+###  AddScript
+
+Serialize the value as a script, not a string. Should be used alongside with
+
+#### Parameters
+
+#### state `System.Collections.Generic.IDictionary{System.String,System.Object}`
+
+The state collection for the values
+
+#### key `System.String`
+
+The key in the JSON object
+
+#### value `System.Object`
+
+The value in the JSON obejct
+
+#### Returns
+
+`System.Void` 
+

Diff for: api/server/Telerik.Web.UI/RadDrawer.md

@@ -107,6 +107,10 @@ Enables or configures the mini mode for the Kendo UI Drawer. This is a compact v
 
 Determines how the Kendo UI Drawer will interact with the associated content. The default one (overlay) will simply overlap the associated content with overlay effect. On the other hand "push" mode will show the drawer next to associated cotent. The associated content will shrink its content.
 
+###  Navigatable `Boolean`
+
+Navigate the widget using the keyboard. By default keyboard navigation is disabled.
+
 ###  Position `DrawerPositionType`
 
 The position of the drawer. Can be left (default) or right.