Fix: use lower case in confirmation message

Co-authored-by: Sarah Norris <[email protected]>

packages/edit-site/src/components/global-styles/shadows-panel.js

@@ -63,7 +63,7 @@ export default function ShadowsPanel() {
 			{ isResetDialogOpen && (
 				<ConfirmResetShadowDialog
 					text={ __(
-						'Are you sure you want to remove all custom Shadows?'
+						'Are you sure you want to remove all custom shadows?'
 					) }
 					confirmButtonText={ __( 'Remove' ) }
 					isOpen={ isResetDialogOpen }