Fix some typos

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

.gitignore

 # the default generated dir + db file
 /data
-/owncloud
 /config/config.php
 /config/*.config.php
 /config/mimetype*.json

lib/private/Config.php

@@ -37,7 +37,7 @@ namespace OC;
 
 /**
  * This class is responsible for reading and writing config.php, the very basic
- * configuration file of ownCloud.
+ * configuration file of Nextcloud.
  */
 class Config {