Update example macro usage

docs/secondary-navigation.md

@@ -8,7 +8,7 @@ description: Allow users to navigate between pages scoped to a section.
 {% from "example/macro.njk" import appExample %}
 
 {{ appExample({
-  component: "secondary-navigation"
+  example: "secondary-navigation"
 }) }}
 
 ## When to use this component
@@ -26,8 +26,7 @@ You could also consider using the [tabs component](https://design-system.service
 ## How it works
 
 {{ appExample({
-  component: "secondary-navigation",
-  example: "with-header"
+  example: "secondary-navigation-with-header"
 }) }}
 
 Unlike [tabs](https://design-system.service.gov.uk/components/tabs/), secondary navigation does not use JavaScript. Each item within the navigation is a link to a separate full page.