[Bottom Sheet] [Docs] Corrected guidance to use modal bottom sheet default style theme attribute for standard bottom sheets and added a callout explaining that there is no default style theme attribute for standard bottom sheets.

PiperOrigin-RevId: 462465244

Author: afohrman

docs/components/BottomSheet.md

@@ -277,9 +277,9 @@ Apply the `BottomSheetBehavior` to a direct child `View` of `CoordinatorLayout`:
 
   <FrameLayout
     android:id="@+id/standard_bottom_sheet"
+    style="@style/Widget.Material3.BottomSheet"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    style="?attr/bottomSheetStyle"
     app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
 
     <!-- Drag handle for accessibility -->
@@ -431,6 +431,11 @@ Attribute                | Related method(s)                 | Default value
 
 Default style theme attribute:`?attr/bottomSheetStyle`
 
+Note: The `?attr/bottomSheetStyle` default style theme attribute is for modal
+bottom sheets only. There is no default style theme attribute for standard
+bottom sheets, because `BottomSheetBehavior`s don't have a designated associated
+`View`.
+
 ### Theme overlays
 
 **Element**               | **Theme overlay**