minor #17745 Fix blank space typo (alexandre-daubois)

This PR was merged into the 5.4 branch.

Discussion
----------

Fix blank space typo

Fixes #17741 (comment)

Commits
-------

5a3409f Fix blank space typo

Author: javiereguiluz

configuration.rst

@@ -57,7 +57,7 @@ Configuration Formats
 ~~~~~~~~~~~~~~~~~~~~~
 
 Unlike other frameworks, Symfony doesn't impose a specific format on you to
-configure your applications, but lets you choose between YAML, XML and PHP. 
+configure your applications, but lets you choose between YAML, XML and PHP.
 Throughout the Symfony documentation, all configuration examples will be
 shown in these three formats.