minor #16592 Fix Symfony installation commands for 6.1 version (javiereguiluz)

This PR was merged into the 6.1 branch.

Discussion
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Fix Symfony installation commands for 6.1 version

Fixes #16551.

Commits
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b9862d0 Fix Symfony installation commands for 6.1 version

Author: javiereguiluz

setup.rst

@@ -49,10 +49,10 @@ application:
 .. code-block:: terminal
 
     # run this if you are building a traditional web application
-    $ symfony new my_project_directory --version=6.1 --webapp
+    $ symfony new my_project_directory --version=next --webapp
 
     # run this if you are building a microservice, console application or API
-    $ symfony new my_project_directory --version=6.1
+    $ symfony new my_project_directory --version=next
 
 The only difference between these two commands is the number of packages
 installed by default. The ``--webapp`` option installs all the packages that you