bug #12110 Fix sample of use of SYMFONY_DEPRECATIONS_HELPER for regex (jderusse)

This PR was merged into the 4.3 branch.

Discussion
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Fix sample of use of SYMFONY_DEPRECATIONS_HELPER for regex

The sample of use of regex for `SYMFONY_DEPRECATIONS_HELPER` is wrong.

See symfony/symfony#33012 (comment)

Commits
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48b2af6 Fix sample of use of SYMFONY_DEPRECATIONS_HELPER for regex

Author: OskarStark

components/phpunit_bridge.rst

@@ -369,7 +369,7 @@ Running the following command will display the full stack trace:
 
 .. code-block:: terminal
 
-    $ SYMFONY_DEPRECATIONS_HELPER='regex=/Doctrine\\Common\\ClassLoader is deprecated\./' ./vendor/bin/simple-phpunit
+    $ SYMFONY_DEPRECATIONS_HELPER='/Doctrine\\Common\\ClassLoader is deprecated\./' ./vendor/bin/simple-phpunit
 
 Time-sensitive Tests
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