Small logic fix

Author: alzimmermsft

sdk/cosmos/azure-cosmos-tests/src/test/java/com/azure/cosmos/implementation/query/DocumentProducerTest.java

@@ -583,7 +583,7 @@ public void simple() {
                     range1,
                     () -> "n/a");
 
-            StepVerifier.create(documentProducer.produceAsync().collectList())
+            StepVerifier.create(documentProducer.produceAsync())
                 .expectNextCount(responses.size())
                 .verifyComplete();