minor #11418 [PhpUnitBridge] ClockMock does not mock gmdate() (Simperfit)

This PR was squashed before being merged into the master branch (closes #11418).

Discussion
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[PhpUnitBridge] ClockMock does not mock gmdate()

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This is a new feature proposed to the master branch, with the following doc update.

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6e0ff0b [PhpUnitBridge] ClockMock does not mock gmdate()

Author: javiereguiluz

components/phpunit_bridge.rst

@@ -325,7 +325,7 @@ Clock Mocking
 
 The :class:`Symfony\\Bridge\\PhpUnit\\ClockMock` class provided by this bridge
 allows you to mock the PHP's built-in time functions ``time()``,
-``microtime()``, ``sleep()`` and ``usleep()``. Additionally the function
+``microtime()``, ``sleep()``, ``usleep()`` and ``gmdate``. Additionally the function
 ``date()`` is mocked so it uses the mocked time if no timestamp is specified.
 Other functions with an optional timestamp parameter that defaults to ``time()``
 will still use the system time instead of the mocked time.