Update node-resource-managers.md

fix typo

Author: gecube

content/en/docs/concepts/policy/node-resource-managers.md

@@ -19,4 +19,4 @@ The configuration of individual managers is elaborated in dedicated documents:
 
 - [CPU Manager Policies](/docs/tasks/administer-cluster/cpu-management-policies/)
 - [Device Manager](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#device-plugin-integration-with-the-topology-manager)
-- [Memory Manger Policies](/docs/tasks/administer-cluster/memory-manager/)
+- [Memory Manager Policies](/docs/tasks/administer-cluster/memory-manager/)