minor #11138 removed blank lines after filepath (OskarStark)

This PR was merged into the 3.4 branch.

Discussion
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removed blank lines after filepath

in xml code blocks to be consistent throughout the docs

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/roadmap for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `master` for features of unreleased versions).

-->

Commits
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bb7914d removed blank lines after filepath

Author: javiereguiluz

service_container/factories.rst

@@ -48,7 +48,6 @@ configure the service container to use the
     .. code-block:: xml
 
         <!-- app/config/services.xml -->
-
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -116,7 +115,6 @@ Configuration of the service container then looks like this:
     .. code-block:: xml
 
         <!-- app/config/services.xml -->
-
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -201,7 +199,6 @@ example takes the ``templating`` service as an argument:
     .. code-block:: xml
 
         <!-- app/config/services.xml -->
-
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"