minor #7812 Fix typo in Clock Mocking part (medinae)

This PR was merged into the 2.8 branch.

Discussion
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Fix typo in Clock Mocking part

Commits
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dec5be0 Fix typo in Clock Mocking part

Author: xabbuh

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