docs(avatar): add group props & preset

docs/content/2.elements/3.avatar.md

@@ -45,7 +45,7 @@ options:
   - name: 'chipColor'
     restriction: 'included'
     values:
-      - 'gray' 
+      - 'gray'
 baseProps:
   src: 'https://avatars.githubusercontent.com/u/739984?v=4'
   alt: 'Avatar'
@@ -82,7 +82,7 @@ props:
 ---
 ::
 
-### Group
+## Group
 
 To stack avatars as a group, use the `AvatarGroup` component.
 
@@ -111,6 +111,12 @@ code: |
 
 :component-props
 
+:u-divider{label="AvatarGroup" type="dashed" class="my-12"}
+
+:component-props{slug="avatar-group"}
+
 ## Preset
 
 :component-preset
+
+:component-preset{slug="avatar-group"}