Base: Update Toolbar manpage

Author: https://github.com/frhun
Commit: 6330de15b6
Pull-request: https://github.com/SerenityOS/serenity/pull/15484
Reviewed-by: https://github.com/AtkinsSJ ✅

Base/usr/share/man/man5/GML-Widget-Toolbar.md

@@ -6,6 +6,10 @@ GML Toolbar Widget
 
 Defines a GUI toolbar widget.
 
+When `collapsible` is set to `true`, the toolbar can be resized below the size of its items.
+Any items that do not fit the current size, will be placed in an overflow menu.
+To keep groups (i.e. Buttons/items separated by Separators) together, and move them to the overflow menu as one, set the `gouped` property.
+
 ## Synopsis
 
 `@GUI::Toolbar`
@@ -15,5 +19,14 @@ Defines a GUI toolbar widget.
 ```gml
 @GUI::Toolbar {
     name: "toolbar"
+    collapsible: true
+    grouped: true
 }
 ```
+
+## Registered Properties
+
+| Property    | Type | Possible values | Description                                                                           |
+|-------------|------|-----------------|---------------------------------------------------------------------------------------|
+| collapsible | bool | true or false   | If items that do not fit should be placed in an overflow menu                         |
+| grouped     | bool | true or false   | If items should be moved to the overflow menu in groups, separated by Separator items |