Update update-settings.asciidoc

Author: Ken MacInnis

docs/reference/cluster/update-settings.asciidoc

@@ -11,7 +11,7 @@ GET /_cluster/settings
 --------------------------------------------------
 // CONSOLE
 
-(See <<cluster-get-settings, Cluster Get Settings>>)
+By default, this API call only returns settings that have been explicitly defined, but can also <<cluster-get-settings,include the default settings>>.
 
 Updates to settings can be persistent, meaning they apply across restarts, or transient, where they don't 
 survive a full cluster restart. Here is an example of a persistent update: