Add VC issue to WN (#1223)

docs/modules/release-notes/pages/5-5-0.adoc

@@ -3,8 +3,6 @@
 
 {description}
 
-// check version delta above
-
 == New Features
 * Vector collection data structure
 * Multi-member routing for Java clients
@@ -20,6 +18,9 @@ For more details on new features, see xref:ROOT:whats-new.adoc[What's new in 5.5
 * For {open-source-product-name} users only - CP Subsystem is now an {enterprise-product-name} only feature
 * Thread-per-core (TPC) requires `ALL_MEMBERS` cluster routing (previously known as smart routing) to function on clients
 
+== Known Issues
+* There is currently a known issue that has potential for causing a memory leak in Vector collections in some scenarios. For more info, including a workaround, see xref:data-structures:vector-collections.adoc#known-issue[Vector Collection Known Issue].
+
 == Enhancements
 * Replace smart-routing with cluster-routing options
 * Update cluster routing mode compatibility for TPC