minor symfony#58487 [DependencyInjection] Fix newline (OskarStark)

This PR was merged into the 5.4 branch.

Discussion
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[DependencyInjection] Fix newline

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#58472 (comment)
| License       | MIT

Commits
-------

8368669 Fix newline

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php

@@ -429,7 +429,7 @@ private function parseFileToDOM(string $file): \DOMDocument
                 }
             }
             if ($errors) {
-                throw new InvalidArgumentException(sprintf('Unable to parse file "%s": ', $file).implode("/n", $errors), $e->getCode(), $e);
+                throw new InvalidArgumentException(sprintf('Unable to parse file "%s": ', $file).implode("\n", $errors), $e->getCode(), $e);
             }
         }