read config.sample.php options and whitespace fixes

config/config.sample.php

@@ -45,6 +45,7 @@ $CONFIG = array(
  *
  * 'instanceid' => 'd3c944a9a',
  */
+'instanceid' => '',
 
  /**
  * The salt used to hash all passwords, auto-generated by the ownCloud
@@ -54,6 +55,7 @@ $CONFIG = array(
  *
  *'passwordsalt' => 'd3c944a9af095aa08f',
  */
+'passwordsalt' => '',
 
 /**
  * Your list of trusted domains that users can log into. Specifying trusted