Property grid: the group doc fits one line

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/data_display/records.rs

@@ -102,8 +102,7 @@ impl RenderOnce for DescriptionList {
     }
 }
 
-/// A titled group of a `PropertyGrid`, open unless `folded`.
+/// A `PropertyGrid` group; its unique title keys its fold.
-/// Its title keys its fold, so titles differ within a grid.
 pub struct PropertyGroup {
     title: SharedString,
     open: bool,