Merge branch '6.4' into 7.0

* 6.4:
  fix references (really)
  fix references
  remove trailing whitespace

Author: xabbuh

scheduler.rst

@@ -417,7 +417,7 @@ be used. Also, by default, the ``__invoke`` method of your service will be calle
 but, it's also possible to specify the method to call via the ``method``option
 and you can define arguments via ``arguments``option if necessary.
 
-.. scheduler-attributes-cron-task::
+.. _scheduler-attributes-cron-task:
 
 ``AsCronTask`` Example
 ......................
@@ -449,7 +449,7 @@ The attribute takes more parameters to customize the trigger::
     // defines the timezone to use
     #[AsCronTask('0 0 * * *', timezone: 'Africa/Malabo')]
 
-.. scheduler-attributes-periodic-task::
+.. _scheduler-attributes-periodic-task:
 
 ``AsPeriodicTask`` Example
 ..........................