[MonologBridge] Fix the server:log help --filter sample

Author: ogizanagi

Command/ServerLogCommand.php

@@ -69,10 +69,9 @@ protected function configure()
 
   <info>php %command.full_name%</info>
 
-To get the information as a machine readable format, use the
-<comment>--filter</> option:
+To filter the log messages using any ExpressionLanguage compatible expression, use the <comment>--filter</> option:
 
-<info>php %command.full_name% --filter=port</info>
+<info>php %command.full_name% --filter="level > 200 or channel in ['app', 'doctrine']"</info>
 EOF
             )
         ;