Remove false from docs

gems/aws-sdk-s3/lib/aws-sdk-s3/customizations/object.rb

@@ -498,7 +498,7 @@ def upload_file(source, options = {})
       #   checksum validation fails. You may provide a `on_checksum_validated`
       #   callback if you need to verify that validation occurred and which
       #   algorithm was used.  To disable checksum validation, set
-      #   `checksum_mode` to "DISABLED" or false.
+      #   `checksum_mode` to "DISABLED".
       #
       # @option options [Callable] on_checksum_validated Called each time a
       #   request's checksum is validated with the checksum algorithm and the