short URL field is specified

Author: rachelsaunders

firestore-shorten-urls/PREINSTALL.md

@@ -2,7 +2,7 @@ Use this extension to create shortened URLs from URLs written to Cloud Firestore
 
 This extension listens to your specified Cloud Firestore collection. If you add a URL to a specified field in any document within that collection, this extension:
 - Shortens the URL.
-- Saves the shortened URL in a new field in the same document.
+- Saves the shortened URL in a new specified field in the same document.
 
 If the original URL in a document is updated, then the shortened URL will be automatically updated, too.