Update draft-batch-api.md

readme-sync/v0/api/draft-batch-api.md

@@ -11,7 +11,7 @@ See the following steps for an overview of the endpoints to call for this use ca
 
 1. Create a batch of N document file names to be extracted with `POST extract/batch`. The endpoint returns the batch ID.
 2.  Create upload URLs for M of the documents with  `PUT extract/batch/upload_urls/{batch_id}/{start_index}/{end_index}`. The endpoint returns the URLs.
-3. Upload the documents to their corresponding URLs.
+3. Upload the documents to their corresponding URLs to request extractions.
 4. Retrieve each extraction with `documents/{extraction_id}`. Each extraction includes the `batchID`.
 
 ## Steps