minor #11736 No explicit use of code-block:: php (OskarStark)

This PR was merged into the 4.2 branch.

Discussion
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No explicit use of code-block:: php

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Commits
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c0f6a6b No explicit use of code-block:: php

Author: javiereguiluz

translation/message_format.rst

@@ -377,9 +377,7 @@ using the :phpclass:`IntlDateFormatter`:
         ];
 
 The "function statement" for the ``time`` and ``date`` functions can be one of
-short, medium, long or full, as documented on PHP.net.
-
-.. code-block:: php
+short, medium, long or full, as documented on PHP.net::
 
     // prints "Published at Jan 25, 2019 - 11:30 AM"
     echo $translator->trans('published_at', ['publication_date' => new \DateTime('2019-01-25 11:30:00')]);