…ions (ogizanagi)

This PR was merged into the 2.7 branch.

Discussion
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[Console] Fix wrong handling of multiline arg/opt descriptions

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #20237, #13220 (comment)
| License       | MIT
| Doc PR        | N/A

### Before

<img width="1072" alt="screenshot 2016-11-30 a 19 23 17" src="https://cloud.githubusercontent.com/assets/2211145/20765428/8b622304-b732-11e6-911b-b169e9aed5fd.PNG">

### After

<img width="1074" alt="screenshot 2016-11-30 a 19 23 46" src="https://cloud.githubusercontent.com/assets/2211145/20765432/9159a53e-b732-11e6-909f-ec8107c78fed.PNG">

@rquadling and @leofeyer deserve the credit for reporting the issue and suggesting the proper fix. I've only executed it.

---

<details>
<summary>Show code to reproduce:</summary>

```php
<?php

use Symfony\Component\Console\Application;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\ArgvInput;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;

require __DIR__.'/../vendor/autoload.php';

(new Application())
    ->add(new class extends Command {
        protected function configure()
        {
            $description = "One of:" . array_reduce(['purge', 'truncate', 'delete', 'insert', 'select'], function ($value, $previous = '') {
                    return "$value\n- $previous";
            });

            $this
                ->setName('execute')
                ->addArgument('action', InputArgument::REQUIRED, $description)
                ->addOption('another-one', 'a', InputOption::VALUE_OPTIONAL, $description)
            ;
        }
    })
    ->getApplication()
    ->run(new ArgvInput())
;
```
</details>

Commits
-------

18fc6b5 [Console] Fix wrong handling of multiline arg/opt descriptions