Fix reference to remote clusters docs

This commit fixes a reference to the remote clusters docs from the
modules page.

docs/reference/modules.asciidoc

@@ -73,7 +73,7 @@ The modules in this section are:
     Configure the transport networking layer, used internally by Elasticsearch
     to communicate between nodes.
 
-<<modules-remote-cluster, Remote cluster>>::
+<<modules-remote-clusters, Remote cluster>>::
     Remote clusters are used in features that work by connecting across clusters on the transport layer.
 
 <<modules-cross-cluster-search, Cross cluster Search>>::