Sweep deprecated todo comment

Change-Id: I6140aa38aff475424e44c6597599703776530f4d
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
index c8084c2..dc3b2a1 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
@@ -347,8 +347,9 @@
         public void execute(Collection<IntentData> operations) {
             log.debug("Execute {} operation(s).", operations.size());
             log.trace("Execute operations: {}", operations);
+
+            // batchExecutor is single-threaded, so only one batch is in flight at a time
             batchExecutor.execute(new IntentBatchProcess(operations));
-            // TODO ensure that only one batch is in flight at a time
         }
     }