fixup! feat: update SendNBatch to fix deficiencies in error handling

update doc to say what returned int is

Author: CallumNZ

aws/sqs/sqs.go

@@ -335,6 +335,7 @@ func (s *SQS) SendBatch(ctx context.Context, queueURL string, bodies []string) e
 // SendNBatch sends any number of messages to a given SQS queue via a series of SendBatch calls.
 // If an error occurs on any or all messages, a SendNBatchError is returned that lets
 // the caller know the index of the message/s in bodies that failed.
+// Returns the number of API calls to SendBatch made.
 func (s *SQS) SendNBatch(ctx context.Context, queueURL string, bodies []string) (int, error) {
 
 	const (