Update outdated comment

lib/private/updater.php

@@ -117,7 +117,7 @@ class Updater extends BasicEmitter {
 		 * START CONFIG CHANGES FOR OLDER VERSIONS
 		 */
 		if (!\OC::$CLI && version_compare($installedVersion, '6.90.1', '<')) {
-			// Add the overwriteHost config if it is not existant
+			// Add the trusted_domains config if it is not existant
 			// This is added to prevent host header poisoning
 			\OC_Config::setValue('trusted_domains', \OC_Config::getValue('trusted_domains', array(\OC_Request::serverHost()))); 
 		}