[FrameworkBundle] Update cache:clear help

Author: BafS

Command/CacheClearCommand.php

@@ -59,7 +59,7 @@ protected function configure()
             ])
             ->setDescription('Clear the cache')
             ->setHelp(<<<'EOF'
-The <info>%command.name%</info> command clears the application cache for a given environment
+The <info>%command.name%</info> command clears and warms up the application cache for a given environment
 and debug mode:
 
   <info>php %command.full_name% --env=dev</info>