minor #12492 [TwigBridge] Add show-deprecations option to the lint:twig command (williamjehanne)

This PR was merged into the 4.4 branch.

Discussion
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[TwigBridge] Add show-deprecations option to the lint:twig command

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Hi,

Fixes #12476 (created by @fabpot), I add `--show-deprecations` options in templates documentation.

Commits
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482db78 [TwigBridge] Add show-deprecations option to the lint:twig command

Author: javiereguiluz

templates.rst

@@ -573,6 +573,9 @@ errors. It's useful to run it before deploying your application to production
     $ php bin/console lint:twig templates/email/
     $ php bin/console lint:twig templates/article/recent_list.html.twig
 
+    # you can show deprecations as errors
+    $ php bin/console lint:twig --show-deprecations templates/email/
+
 .. versionadded:: 4.4
 
     The feature that checks all the application templates when not passing any