more accurate usage description

Author: alexreardon

src/screen-reader-message-preset.js

@@ -18,7 +18,7 @@ export type MessagePreset = {|
 const dragHandleUsageInstructions: string = `
   Press space bar to start a drag.
   When dragging you can use the arrow keys to move the item around and escape to cancel.
-  Ensure your screen reader is in focus mode or forms mode
+  Some screen readers may require you to be in focus mode or to use your pass through key
 `;
 
 const position = (index: number): number => index + 1;