Merge pull request #47912 from nextcloud/backport/47906/stable30

[stable30] chore: Update trashbin retention documentation with exceeded quota details

config/config.sample.php

@@ -745,6 +745,11 @@
 /**
  * If the trash bin app is enabled (default), this setting defines the policy
  * for when files and folders in the trash bin will be permanently deleted.
+ *
+ * If the user quota limit is exceeded due to deleted files in the trash bin,
+ * retention settings will be ignored and files will be cleaned up until
+ * the quota requirements are met.
+ *
  * The app allows for two settings, a minimum time for trash bin retention,
  * and a maximum time for trash bin retention.
  *