docs: Update legend value to match story

Signed-off-by: Akshat Patel <[email protected]>

Author: Akshat55

src/tiles/tiles.stories.ts

@@ -174,7 +174,7 @@ storiesOf("Components|Tiles", module)
 				Edit on Carbon UI Builder
 			</a>
 			<br><br>
-			<ibm-tile-group (selected)="selected($event)" [multiple]="true" legend="Radio tile group">
+			<ibm-tile-group (selected)="selected($event)" [multiple]="true" legend="Multi-select tile group">
 				<ibm-selection-tile value="tile1" [selected]="true" [theme]="theme" [disabled]="disabled">Selectable Tile</ibm-selection-tile>
 				<ibm-selection-tile value="tile2" [theme]="theme" [disabled]="disabled">Selectable Tile</ibm-selection-tile>
 				<ibm-selection-tile value="tile3" [theme]="theme" [disabled]="disabled">Selectable Tile</ibm-selection-tile>