Update concepts-nexus-kubernetes-placement.md

Add support for small SKU CP/agentpool nodes to affine togethter

Author: manojkva

articles/operator-nexus/concepts-nexus-kubernetes-placement.md

@@ -57,6 +57,11 @@ following sorting rules:
    "bin packs" the extra-large VMs in order to reduce fragmentation of the
    available compute resources.
 
+1. The above "bin packs" rule apply for non-large VMs in addition to large VMs.This
+   should "pack" smaller VMs from different clusters onto the same baremetal machines,
+   increasing the overall placement efficiency. For example control plane nodes & small-SKU
+   Nodes (agent pool) from different clusters affine together.
+
 ## Example placement scenarios
 
 The following sections highlight behavior that Nexus users should expect