Fixed syntax error (#4544)

Author: sy-records

appendices/migration70/incompatible/error-handling.xml

@@ -54,7 +54,7 @@ function handler(Exception $e) { /* ... */ }
 set_exception_handler('handler');
 
 // PHP 5 and 7 compatible.
-function handler($e) { ... }
+function handler($e) { /* ... */ }
 
 // PHP 7 only.
 function handler(Throwable $e) { /* ... */ }