minor symfony#12055 fix typo (xabbuh)

This PR was merged into the 3.4 branch.

Discussion
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fix typo

Commits
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cbe8826 fix typo

Author: OskarStark

components/phpunit_bridge.rst

@@ -148,7 +148,7 @@ The modified PHPUnit script will recursively go through the provided directory,
 up to a depth of 3 subfolders or the value specified by the environment variable
 ``SYMFONY_PHPUNIT_MAX_DEPTH``, looking for ``phpunit.xml.dist`` files and then
 running each suite it finds in parallel, collecting their output and displaying
-each test suite results in their own section.
+each test suite's results in their own section.
 
 Trigger Deprecation Notices
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