Add missing word to remote clusters docs
This commit adds a missing word in the initial section of the remote
clusters docs.
@@ -8,7 +8,7 @@ a remote cluster. This functionality is used in
endif::[]
ifdef::include-xpack[]
The _remote clusters_ module allows establishing uni-directional connections to
-a remote cluster. This functionality is used in cross-cluster replication,
+a remote cluster. This functionality is used in cross-cluster replication, and
<<modules-cross-cluster-search,cross-cluster search>>.
endif::[]
