add beta channel advice to the updatenotification section

Signed-off-by: szaimen <szaimen@e.mail.de>
Signed-off-by: nextcloud-command <nextcloud-command@users.noreply.github.com>

Author: szaimen

apps/updatenotification/src/components/UpdateNotification.vue

@@ -84,6 +84,11 @@
 			</template>
 		</div>
 
+		<div>
+			{{ t('updatenotification', 'You can change the update channel below which also affects the apps management page.') }} <br>
+			{{ t('updatenotification', 'E.g. after switching to the beta channel, beta app updates will be offered to you in the apps management page.') }}
+		</div>
+
 		<h3 class="update-channel-selector">
 			{{ t('updatenotification', 'Update channel:') }}
 			<div v-click-outside="closeUpdateChannelMenu" class="update-menu">