Updated example description

Author: thatblindgeye

packages/react-core/src/components/ToggleGroup/examples/ToggleGroup.md

@@ -69,7 +69,7 @@ To apply compact styling to a `<ToggleGroup>`, use `isCompact`.
 
 ### Full-width toggle group
 
-To make toggle group items fill the available horizontal space, use `isFill`.
+To make toggle group items fill the available horizontal space, use `isFill` on a `<ToggleGroup>`.
 
 ```ts file="./ToggleGroupFill.tsx"