minor #19591 [Process] create_new_console option only on Windows (thomas-l)

This PR was submitted for the 7.0 branch but it was merged into the 5.4 branch instead.

Discussion
----------

[Process] create_new_console option only on Windows

Commits
-------

25eac32 create_new_console option only on Windows

Author: javiereguiluz

components/process.rst

@@ -104,6 +104,10 @@ Configuring Process Options
 
     The feature to configure process options was introduced in Symfony 5.2.
 
+.. caution::
+
+    Windows only
+
 Symfony uses the PHP :phpfunction:`proc_open` function to run the processes.
 You can configure the options passed to the ``other_options`` argument of
 ``proc_open()`` using the ``setOptions()`` method::