Fixed the versionadded directive (RST syntax)

Author: guilliamxavier

logging/monolog_exclude_http_codes.rst

@@ -6,7 +6,7 @@
 How to Configure Monolog to Exclude Specific HTTP Codes from the Log
 ====================================================================
 
-..versionadded:: 4.1
+.. versionadded:: 4.1
     The ability to exclude log messages based on their status codes was
     introduced in Symfony 4.1 and MonologBundle 3.3.