fix(NcAppNavigationCaption): limit style to example

Signed-off-by: Raimund Schlüßler <[email protected]>

Author: raimund-schluessler

src/components/NcAppNavigationCaption/NcAppNavigationCaption.vue

@@ -35,7 +35,7 @@
 ### Element with a slot for custom actions icon
 ```vue
 	<template>
-		<ul>
+		<ul class="nav">
 			<NcAppNavigationCaption
 				name="Your caption goes here">
 				<template #actionsTriggerIcon>
@@ -89,7 +89,7 @@
 	</script>
 	<style scoped>
 		/* mock the appnavigation */
-		ul {
+		ul.nav {
 			background-color: #cce6f4;
 		}
 	</style>