update description of page.navigation property in UI model

docs/modules/ROOT/pages/templates.adoc

@@ -113,7 +113,7 @@ Each entry has the properties url, string, and missing.
 Includes text-only and external items.
 
 | page.navigation
-| A collection of navigation links for the current page.
+| The hierarchical navigation menu for the component version of the current page.
 Each navigation item contains the property `content` as well as the optional properties `url` and (child) `items`.
 
 | page.url