minor #10024 Removed the PHP templates from Symfony 4.0 docs (javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
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Removed the PHP templates from Symfony 4.0 docs

After removing PHP templates from 2.8, let's do the same in the other branches. I didn't find any new PHP template in 3.4, so this PR goes to the 4.0 branch.

Commits
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9eaf09e Removed the PHP templates from Symfony 4.0 docs

Author: javiereguiluz

translation/debug.rst

@@ -10,25 +10,16 @@ When maintaining an application or bundle, you may add or remove translation
 messages and forget to update the message catalogues. The ``debug:translation``
 command helps you to find these missing or unused translation messages templates:
 
-.. configuration-block::
-
-    .. code-block:: twig
-
-        {# messages can be found when using the trans/transchoice filters and tags #}
-        {% trans %}Symfony is great{% endtrans %}
+.. code-block:: twig
 
-        {{ 'Symfony is great'|trans }}
+    {# messages can be found when using the trans/transchoice filters and tags #}
+    {% trans %}Symfony is great{% endtrans %}
 
-        {{ 'Symfony is great'|transchoice(1) }}
-
-        {% transchoice 1 %}Symfony is great{% endtranschoice %}
-
-    .. code-block:: php
+    {{ 'Symfony is great'|trans }}
 
-        // messages can be found when using the trans() and transChoice() methods
-        $view['translator']->trans("Symfony is great");
+    {{ 'Symfony is great'|transchoice(1) }}
 
-        $view['translator']->transChoice('Symfony is great', 1);
+    {% transchoice 1 %}Symfony is great{% endtranschoice %}
 
 .. caution::