Fixes reported by reviewers

Author: javiereguiluz

setup.rst

@@ -35,14 +35,14 @@ application:
     $ symfony new --full my_project_name
 
     # run this if you are building a microservice, console application or API
-    $ symfony new my-project
+    $ symfony new my_project_name
 
 The only difference between these two commands is the number of packages
 installed by default. The ``--full`` option installs all the packages that you
 usually need to build web applications, so the installation size will be bigger.
 
 If you can't or don't want to `install Symfony`_ for any reason, run these
-commands to create the new Symfony applications using Composer:
+commands to create the new Symfony application using Composer:
 
 .. code-block:: terminal
 
@@ -201,7 +201,7 @@ According to the :doc:`Symfony release process </contributing/community/releases
 "long-term support" (or LTS for short) versions are published every two years.
 Check out the `Symfony roadmap`_ to know which is the latest LTS version.
 
-By default, the commands that create new Symfony applications use the latest
+By default, the command that creates new Symfony applications uses the latest
 stable version. If you want to use an LTS version, add the ``--version`` option:
 
 .. code-block:: terminal