Add comment for block edit/delete access

block_region_permissions.module

@@ -120,6 +120,7 @@ function block_region_permissions_block_access(Block $block, $operation, Account
 
       // Skip disabled/none.
       if ($region_key != -1) {
+        // Negate to hide operation link.
         return AccessResult::forbiddenIf(!\Drupal::currentUser()->hasPermission("administer $theme_key $region_key"));
       }
   }