change voice of create, update, etc. sentence

Author: rachelsaunders

firestore-bigquery-export/PREINSTALL.md

@@ -4,7 +4,7 @@ The extension creates and updates a [dataset](https://cloud.google.com/bigquery/
 +   A [table](https://cloud.google.com/bigquery/docs/tables-intro) of raw data that stores a full change history of the documents within your collection. This table includes a number of metadata fields so that BigQuery can display the current state of your data. The principle metadata fields are `timestamp`, `document_name`, and the `operation` for the document change.
 +   A [view](https://cloud.google.com/bigquery/docs/views-intro) which represents the current state of the data within your collection. It also shows a log of the latest `operation` for each document (`CREATE`, `UPDATE`, or `IMPORT`).
 
-Whenever a document is created, updated, deleted, or imported in the specified collection, this extension sends that update to BigQuery. You can then run queries on this mirrored dataset.
+If you create, update, delete, or import a document in the specified collection, this extension sends that update to BigQuery. You can then run queries on this mirrored dataset.
 
 Note that this extension only listens for _document_ changes in the collection, but not changes in any _subcollection_. You can, though, install additional instances of this extension to specifically listen to a subcollection or other collections in your database. Or if you have the same subcollection across documents in a given collection, you can use `{wildcard}` notation to listen to all those subcollections (for example: `chats/{chatid}/posts`).