Adds s3 use-checksum

Author: Robert Fekete

content/chapter-destinations/destination-s3/_index.md

@@ -307,6 +307,17 @@ If you configure an invalid value, the default is used.
 
 *Description:* The number of {{% param "product_name" %}} worker threads that are used to upload data to S3 from this destination.
 
+## use-checksum()
+
+|          |           |
+| -------- | --------- |
+| Type:    | `when_supported` or `when_required` |
+| Default: | `when_supported`  |
+
+Available in {{< product >}} 4.20 and later.
+
+*Description:* Change the default checksum settings for S3 compatible solutions that don't support checksums.
+
 ## template()
 
 |          |                               |