fix some docs issues

docs/reference/modules.asciidoc

@@ -80,7 +80,7 @@ The modules in this section are:
 
 <<modules-cross-cluster-search, Cross cluster Search>>::
 
-    Cross cluster search allows to execute search requests across more than one cluster without joining them and acts
+    Cross cluster search enables executing search requests across more than one cluster without joining them and acts
     as a federated client across them.
 --
 

docs/reference/modules/cross-cluster-search.asciidoc

@@ -111,7 +111,7 @@ will be prefixed with their remote cluster name:
 * `search.remote.connections_per_cluster` - the number of nodes to connect to per remote cluster. The default is `3`
 * `search.remote.initial_connect_timeout` - the time to wait for remote connections to be established when the node
 starts. The default is `30s`.
-* `search.remote.node_attribute` - a node attribute to filter out nodes that are eligible as a gateway node in the
+* `search.remote.node.attr` - a node attribute to filter out nodes that are eligible as a gateway node in the
 remote cluster. For instance a node can have a node attribute `node.attr.gateway: true`  such that only nodes with this
- attribute will be connected to if `search.remote.node_attribute` is set to `gateway`
+ attribute will be connected to if `search.remote.node.attr` is set to `gateway`