fix typo in comment

config/config.sample.php

@@ -86,7 +86,7 @@ $CONFIG = array(
 /* Password to use for sendmail mail, depends on mail_smtpauth if this is used */
 "mail_smtppassword" => "",
 
-/* how long should ownCloud keep delteted files in the trash bin, default value:  180 days */
+/* How long should ownCloud keep deleted files in the trash bin, default value:  180 days */
 'trashbin_retention_obligation' => 180,
 
 /* Check 3rdparty apps for malicious code fragments */