minor #9396 Fixes deprecated ProcessBuilder usage (guillbdx, javiereguiluz)

This PR was merged into the 3.4 branch.

Discussion
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Fixes deprecated ProcessBuilder usage

Commits
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6f51762 Use the long array syntax
3582287 Fixes deprecated ProcessBuilder usage

Author: javiereguiluz

components/console/helpers/processhelper.rst

@@ -14,7 +14,7 @@ a very verbose verbosity (e.g. -vv)::
     use Symfony\Component\Process\ProcessBuilder;
 
     $helper = $this->getHelper('process');
-    $process = ProcessBuilder::create(array('figlet', 'Symfony'))->getProcess();
+    $process = new Process(array('figlet', 'Symfony'));
 
     $helper->run($output, $process);
 
@@ -55,7 +55,7 @@ There are three ways to use the process helper:
     use Symfony\Component\Process\ProcessBuilder;
 
     // ...
-    $process = ProcessBuilder::create(array('figlet', 'Symfony'))->getProcess();
+    $process = new Process(array('figlet', 'Symfony'));
 
     $helper->run($output, $process);