Add real-world example to separate flags and value

Also see symfony/symfony#29573

Author: holtkamp

components/process.rst

@@ -111,7 +111,8 @@ with a non-zero code)::
     saves you from any escaping and allows sending signals seamlessly
     (e.g. to stop processes before completion.)::
 
-        $process = new Process(['/path/command', '--flag', 'arg 1', 'etc.']);
+        $process = new Process(['/path/command', '--option', 'argument', 'etc.']);
+        $process = new Process(['/path/to/php', '--define', 'memory_limit=1024M', '/path/to/script.php']);
 
     If you need to use stream redirections, conditional execution, or any other
     feature provided by the shell of your operating system, you can also define