small improvements from testing session

Author: LFDanLu

packages/@react-spectrum/s2/stories/ComboBox.stories.tsx

@@ -237,6 +237,7 @@ const AsyncComboBox = (args: any) => {
   return (
     <ComboBox
       {...args}
+      styles={style({marginBottom: 40})}
       items={list.items}
       inputValue={list.filterText}
       onInputChange={list.setFilterText}

packages/react-aria-components/example/index.css

@@ -72,6 +72,9 @@ html {
 
 .item {
   padding: 2px 5px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
   outline: none;
   cursor: default;
   color: black;