minor #12147 Mention the new check:requirements command (javiereguiluz)

This PR was squashed before being merged into the 3.4 branch (closes #12147).

Discussion
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Mention the new check:requirements command

We may add this command soon to the Symfony binary.

Commits
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6f816ef Mention the new check:requirements command

Author: javiereguiluz

deployment.rst

@@ -117,11 +117,12 @@ you'll need to do:
 A) Check Requirements
 ~~~~~~~~~~~~~~~~~~~~~
 
-Check if your server meets the requirements by running:
+Check if your server meets the requirements by running the following command
+provided by the ``symfony`` binary created when `installing Symfony`_:
 
 .. code-block:: terminal
 
-    $ php bin/symfony_requirements
+    $ symfony check:requirements
 
 .. _b-configure-your-app-config-parameters-yml-file:
 
@@ -248,3 +249,4 @@ kernel and return your project's root directory::
 .. _`Deployer`: http://deployer.org/
 .. _`Git Tagging`: https://git-scm.com/book/en/v2/Git-Basics-Tagging
 .. _`EasyDeployBundle`: https://github.com/EasyCorp/easy-deploy-bundle
+.. _`installing Symfony`: https://symfony.com/download

reference/requirements.rst

@@ -29,14 +29,18 @@ to avoid leaking internal information about your application to visitors.
 Checking Requirements for the Command Console
 ---------------------------------------------
 
-Open your console or terminal, enter in your project directory, execute this
-command and fix the reported issues:
+Open your console or terminal and run the following command provided by the
+``symfony`` binary created when `installing Symfony`_:
 
 .. code-block:: terminal
 
-    $ cd my-project/
-    $ php bin/symfony_requirements
+    # checks if your computer/server is ready to run Symfony projects
+    $ symfony check:requirements
+
+    # use the --dir option to also check if some specific Symfony project is ready to be run
+    $ symfony check:requirements --dir=/path/to/my-project
 
 .. _`Symfony Standard Edition`: https://github.com/symfony/symfony-standard
 .. _`skeleton`: https://github.com/symfony/skeleton
 .. _`website-skeleton`: https://github.com/symfony/website-skeleton
+.. _`installing Symfony`: https://symfony.com/download