remove inaccurate language from config.sample.php

Signed-off-by: Andrew Summers <18727110+summersab@users.noreply.github.com>

config/config.sample.php

@@ -1928,8 +1928,7 @@
 /**
  * Override where Nextcloud stores the ``appdata_INSTANCEID`` directory. Useful
  * when using remote object storage where local system disks provide faster data
- * access or when using shared storage for ``appdata_INSTANCEID`` between
- * multiple Nextcloud systems. Defaults to `datadirectory` if unset.
+ * access. Defaults to `datadirectory` if unset.
  * 
  * The Web server user must have write access to this directory.
  */