OVERVIEW.md in google-cloud-firestore-2.7.0 vs OVERVIEW.md in google-cloud-firestore-2.7.1

@@ -106,10 +106,10 @@
 documents and nothing else. It can't directly contain raw fields with values,
 and it can't contain other collections. You do not need to "create" or "delete"
 collections. After you create the first document in a collection, the collection
 exists. If you delete all of the documents in a collection, it no longer exists.
 (For more information, see [Cloud Firestore Data
-Model](https://cloud.google.com/firestore/docs/data-model).
+Model](https://cloud.google.com/firestore/docs/data-model).)
 
 Use {Google::Cloud::Firestore::Client#cols Client#cols} to list the root-level
 collections:
 
 ```ruby