Updated used icons in documentation

site/docs/extensions/custom-view.md

@@ -60,8 +60,22 @@ This extension adds the ability to create a custom view to display the data.
 
 ### Icons
 
-- customViewOn: `glyphicon glyphicon-eye-open`
-- customViewOff: `glyphicon glyphicon-eye-open`
+- customViewOn: 
+    * Bootstrap3: `glyphicon glyphicon-list`
+    * Bootstrap4: `fa fa-eye`
+    * bootstrap5: 'bi-eye',
+    * Semantic: `fa fa-eye`
+    * Foundation: `fa fa-eye`
+    * Bulma: `fa fa-eye`
+    * Materialize: `remove_red_eye`
+- customViewOff:
+    * Bootstrap3: `glyphicon glyphicon-thumbnails`
+    * Bootstrap4: `fa fa-th`
+    * bootstrap5: 'bi-grid',
+    * Semantic: `fa fa-th`
+    * Foundation: `fa fa-th`
+    * Bulma: `fa fa-th`
+    * Materialize: `grid_on`
 
 ## Methods