fix(db): Fix replica password example config

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

config/config.sample.php

@@ -155,8 +155,8 @@
  * Specify read only replicas to be used by Nextcloud when querying the database
  */
 'dbreplica' => [
- ['user' => 'replica1', 'password', 'host' => '', 'dbname' => ''],
- ['user' => 'replica1', 'password', 'host' => '', 'dbname' => ''],
+ ['user' => 'nextcloud', 'password' => 'password1', 'host' => 'replica1', 'dbname' => ''],
+ ['user' => 'nextcloud', 'password' => 'password2', 'host' => 'replica2', 'dbname' => ''],
 ],
 
 /**