Fix typo in Clock Mocking part

Author: AbdelKader Bouadjadja

components/phpunit_bridge.rst

@@ -151,7 +151,7 @@ If you have this kind of time-related tests::
 
 You used the :doc:`Symfony Stopwatch Component </components/stopwatch>` to
 calculate the duration time of your process, here 10 seconds. However, depending
-on the load of the server your the processes running on your local machine, the
+on the load of the server or the processes running on your local machine, the
 ``$duration`` could for example be `10.000023s` instead of `10s`.
 
 This kind of tests are called transient tests: they are failing randomly