combo_box: Add ComboBoxStory to gallery with 10 demo sections

Author: regexident

crates/story/src/gallery.rs

@@ -50,6 +50,7 @@ impl Gallery {
                     StoryContainer::panel::<ClipboardStory>(window, cx),
                     StoryContainer::panel::<CollapsibleStory>(window, cx),
                     StoryContainer::panel::<ColorPickerStory>(window, cx),
+                    StoryContainer::panel::<ComboBoxStory>(window, cx),
                     StoryContainer::panel::<DatePickerStory>(window, cx),
                     StoryContainer::panel::<DescriptionListStory>(window, cx),
                     StoryContainer::panel::<DialogStory>(window, cx),