minor symfony#9829 Update deployment.rst (raulconti, javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
----------

Update deployment.rst

bin/symfony_requirements script is no longer exists in Flex

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/roadmap for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `master` for features of unreleased versions).

-->

Commits
-------

3195870 Reword
5d4e6c9 Update deployment.rst

Author: javiereguiluz

deployment.rst

@@ -116,11 +116,8 @@ you'll need to do:
 A) Check Requirements
 ~~~~~~~~~~~~~~~~~~~~~
 
-Check if your server meets the requirements by running:
-
-.. code-block:: terminal
-
-    $ php bin/symfony_requirements
+Use the :doc:`Symfony Requirements Checker </reference/requirements>` to check
+if your server meets the technical requirements to run Symfony applications.
 
 .. _b-configure-your-app-config-parameters-yml-file: