docs: include allowExcessMessages in docs example (#1245)

Lucas Johnston · feywind · web-flow · commit e85b34cbe099 · 2021-04-14T14:36:44.000-04:00
As per #784 Co-authored-by: Megan Potter <57276408+feywind@users.noreply.github.com>
diff --git a/samples/synchronousPullWithLeaseManagement.js b/samples/synchronousPullWithLeaseManagement.js
@@ -60,6 +60,7 @@ function main(
     const request = {
       subscription: formattedSubscription,
       maxMessages: maxMessages,
+      allowExcessMessages: false,
     };
 
     let isProcessed = false;
