docs(icons): next chunk

Author: svdimitr

components/gantt/gantt-tree/templates/column-header.md

@@ -63,7 +63,7 @@ By default columns display the name of the corresponding field or their `Title`
                      Width="100px">
             <HeaderTemplate>
                 <span>
-                    <TelerikFontIcon Icon="image" />
+                    <TelerikFontIcon Icon=FontIcon.Image />
                     Column with Icon
                 </span>
             </HeaderTemplate>

components/gantt/timeline/templates/tooltip.md

@@ -45,7 +45,7 @@ Apart from that, you can add and customize any other content - for example, icon
               OnDelete="@DeleteItem">
     <TooltipTemplate>
             <h5>@(((TooltipTemplateContext)context).Title)</h5>        
-            <TelerikFontIcon Class="status" Icon="rotate"></TelerikIcon>
+            <TelerikFontIcon Class="status" Icon=FontIcon.Rotate></TelerikIcon>
             @(((TooltipTemplateContext)context).DataAttributes["percent"])% Completed                
         <br />
     </TooltipTemplate>

knowledge-base/grids-foreign-key.md

@@ -89,7 +89,7 @@ own data source and return it from a service to render in the corresponding head
                 </TelerikMultiSelect>
                 <TelerikButton ButtonType="ButtonType.Button"
                                Class="k-clear-button-visible ml-2"
-                               Icon="filter"
+                               Icon=FontIcon.Filter
                                Enabled="@( FilteredRoles.Any() )"
                                OnClick="@(async () =>
                                           {