Improve vague wording (#127)

Author: nathan-contino-mongo

source/usage-examples/bulkWrite.txt

@@ -15,9 +15,8 @@ Perform Bulk Operations
 The ``bulkWrite()`` method performs batch write operations against a
 *single* collection. This method reduces the number of network round trips from
 your application to the server which therefore increases the throughput and
-performance. Since you only receive the success status after the batch
-write returns, we recommend you use this if that meets the requirements
-of your use case.
+performance. Bulk writes return a collection of results for all operations
+only after *all* operations passed to the method complete.
 
 You can specify one or more of the following write operations in
 ``bulkWrite()``: