minor #36795 [Messenger] Missing description in `messenger:setup-tran…

…sports` command (carlosbuenosvinos)

This PR was submitted for the master branch but it was merged into the 4.4 branch instead.

Discussion
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[Messenger] Missing description in `messenger:setup-transports` command

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

making `bin/console` to show an empty description when the rest of the commands have one.

![image](https://user-images.githubusercontent.com/351553/81716773-122bc200-947a-11ea-84ef-18ec8d19e479.png)

Commits
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d31d1e0 Missing description in `messenger:setup-transports` command

src/Symfony/Component/Messenger/Command/SetupTransportsCommand.php

@@ -41,6 +41,7 @@ protected function configure()
     {
         $this
             ->addArgument('transport', InputArgument::OPTIONAL, 'Name of the transport to setup', null)
+            ->setDescription('Prepares the required infrastructure for the transport')
             ->setHelp(<<<EOF
 The <info>%command.name%</info> command setups the transports: