minor #18371 Symfony 6.4 documentation changes (StaffNowa)

This PR was merged into the 6.4 branch.

Discussion
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Symfony 6.4 documentation changes

Small changes

Commits
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1c5902d setup.rst documentation fix

Author: javiereguiluz

setup.rst

@@ -46,10 +46,10 @@ application:
 .. code-block:: terminal
 
     # run this if you are building a traditional web application
-    $ symfony new my_project_directory --version="6.3.*" --webapp
+    $ symfony new my_project_directory --version="6.4.*@dev" --webapp
 
     # run this if you are building a microservice, console application or API
-    $ symfony new my_project_directory --version="6.3.*"
+    $ symfony new my_project_directory --version="6.4.*@dev"
 
 The only difference between these two commands is the number of packages
 installed by default. The ``--webapp`` option installs all the packages that you
@@ -61,12 +61,12 @@ Symfony application using Composer:
 .. code-block:: terminal
 
     # run this if you are building a traditional web application
-    $ composer create-project symfony/skeleton:"6.3.*" my_project_directory
+    $ composer create-project symfony/skeleton:"6.4.*@dev" my_project_directory
     $ cd my_project_directory
     $ composer require webapp
 
     # run this if you are building a microservice, console application or API
-    $ composer create-project symfony/skeleton:"6.3.*" my_project_directory
+    $ composer create-project symfony/skeleton:"6.4.*@dev" my_project_directory
 
 No matter which command you run to create the Symfony application. All of them
 will create a new ``my_project_directory/`` directory, download some dependencies