minor #18343 Fix code block (jdreesen)

This PR was merged into the 5.4 branch.

Discussion
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Fix code block

(I assume) this fixes this broken code block:

![grafik](https://github.com/symfony/symfony-docs/assets/424602/93d45ddf-0570-4fd3-bd24-964f7360c964)

Commits
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fee66c0 Fix code block

Author: OskarStark

lock.rst

@@ -281,7 +281,7 @@ case version of its name suffixed by ``LockFactory``.
 
 For instance, the ``invoice`` lock can be injected by naming the argument
 ``$invoiceLockFactory`` and type-hinting it with
-:class:`Symfony\\Component\\Lock\\LockFactory`:
+:class:`Symfony\\Component\\Lock\\LockFactory`::
 
     // src/Controller/PdfController.php
     namespace App\Controller;