docs: added sync configuration reference

docs/install.rst

@@ -92,7 +92,7 @@ Limits the amount of successful tasks saved to Django.
  - Defaults to ``250``
  - Failures are always saved.
 
-.. _queue_limit:
+.. _sync:
 
 sync
 ~~~~
@@ -100,6 +100,8 @@ sync
 When set to ``True`` this configuration option forces all :func:`async` calls to be run with ``sync=True``.
 Effectively making everything synchronous. Useful for testing. Defaults to ``False``.
 
+.. _queue_limit:
+
 queue_limit
 ~~~~~~~~~~~
 
@@ -109,7 +111,7 @@ It can also be used to manage the loss of data in case of a cluster failure.
 Defaults to ``None``, meaning no limit.
 
 label
-~~~~~
+~~~~~Dev
 
 The label used for the Django Admin page. Defaults to ``'Django Q'``
 

docs/tasks.rst

@@ -54,6 +54,7 @@ Overrides the cluster's timeout setting for this task.
 sync
 """"
 Simulates a task execution synchronously. Useful for testing.
+Can also be forced globally via the :ref:`sync` configuration option.
 
 redis
 """""