minor #11753 Remove space before self closing xml tag (OskarStark)

This PR was merged into the 3.4 branch.

Discussion
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Remove space before self closing xml tag

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Commits
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d8367f0 Remove space before self closing xml tag

Author: javiereguiluz

components/phpunit_bridge.rst

@@ -575,7 +575,7 @@ If you have installed the bridge through Composer, you can run it by calling e.g
 
     It's possible to change the base version of PHPUnit by setting the
     ``SYMFONY_PHPUNIT_VERSION`` env var in the ``phpunit.xml.dist`` file (e.g.
-    ``<server name="SYMFONY_PHPUNIT_VERSION" value="5.5" />``). This is the
+    ``<server name="SYMFONY_PHPUNIT_VERSION" value="5.5"/>``). This is the
     preferred method as it can be committed to your version control repository.
 
     It's also possible to set ``SYMFONY_PHPUNIT_VERSION`` as a real env var