Fix sidebar_navigation key

help/user-guide/activity.md

@@ -1,7 +1,7 @@
 
 
 ---
-nav:
+sidebar_navigation:
   title: Activity
   priority: 890
 description: Find out about the Activity within a project

help/user-guide/project-overview.md

@@ -1,5 +1,5 @@
 ---
-nav:
+sidebar_navigation:
   title: Project overview
   priority: 900
 description: Learn how to configure a project overview page
@@ -203,4 +203,4 @@ To **re-size** a widget, click on the grey icon in the lower right hand corner o
 
 To remove a widget from the project overview page, click on the three dots at the top right corner of the widget and select **Remove widget**.
 
-![remove-widget](remove-widget.png)
+![remove-widget](remove-widget.png)

help/user-guide/roadmap.md

@@ -1,5 +1,5 @@
 ---
-nav:
+sidebar_navigation:
   title: Product roadmap and release planning
   priority: 880
 description: Find out about the Product Roadmap and Release planning in OpenProject