Apply suggestions from code review

Author: NataliaIvakina

modules/ROOT/content-nav.adoc

@@ -148,7 +148,6 @@
 *** xref:clustering/setup/routing.adoc[]
 *** xref:clustering/setup/encryption.adoc[]
 ** xref:clustering/servers.adoc[]
-** xref:clustering/unbind.adoc[]
 ** xref:clustering/databases.adoc[]
 ** Monitoring
 *** xref:clustering/monitoring/show-servers-monitoring.adoc[]

modules/ROOT/pages/clustering/index.adoc

@@ -15,7 +15,6 @@ This chapter describes the following:
 ** xref:clustering/setup/routing.adoc[Leadership, routing and load balancing] -- Election of leaders, routing and load balancing.
 ** xref:clustering/setup/encryption.adoc[Intra-cluster encryption] -- How to secure the cluster communication.
 * xref:clustering/servers.adoc[Managing servers in a cluster] -- How to manage the servers in a cluster.
-* xref:clustering/unbind.adoc[Unbind a server] -- How to remove and archive the cluster state of a cluster server so that it can rebind to a cluster.
 * xref:clustering/databases.adoc[Managing databases in a cluster] -- How to manage the databases in a cluster.
 * Monitoring -- Monitoring of a cluster.
 ** xref:clustering/monitoring/show-servers-monitoring.adoc[Monitor servers] -- The tools available for monitoring the servers in a cluster.