chore(nextcloud): improve values documentation (to make them helm-docs ready)

part of #547

Signed-off-by: WrenIX <dev.github@wrenix.eu>

Author: wrenix

charts/nextcloud/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: nextcloud
-version: 6.6.3
+version: 6.6.4
 # renovate: image=docker.io/library/nextcloud
 appVersion: 30.0.5
 description: A file sharing server that puts the control and security of your own data back into your hands.