Fix cluster usage docs test
broke the docs tests because $node_name in the URL doesn't (#27616)seem to be replaced.
Changing this to a * to match all nodes seems to fix the test
@@ -14,7 +14,7 @@ GET _nodes/nodeId1,nodeId2/usage
--------------------------------------------------
// CONSOLE
// TEST[setup:node]
-// TEST[s/nodeId1,nodeId2/\$node_name/]
+// TEST[s/nodeId1,nodeId2/*/]
The first command retrieves usage of all the nodes in the cluster. The
second command selectively retrieves nodes usage of only `nodeId1` and
