message: docs: add avatar props table
diff: @@ -183,6 +183,8 @@ prop.
  `Avatar` composes the `Box` component so you can pass all its props. These are
  props specific to the `Avatar` component:
  +<PropsTable of="Avatar" />
  +
  ### Avatar Group Props
  `AvatarGroup` composes the `Box` component so you can pass all its props. These
  