add trailing comma

Author: OskarStark

reference/forms/types/options/attr_translation_parameters.rst.inc

@@ -29,7 +29,7 @@ You can specify the placeholder values as follows::
         ],
         'attr_translation_parameters' => [
             '%company%' => 'ACME Inc.',
-        ]
+        ],
     ]);
 
 The ``attr_translation_parameters`` option of children fields is merged with the

reference/forms/types/options/help_translation_parameters.rst.inc

@@ -24,7 +24,7 @@ You can specify the placeholder values as follows::
         'help' => 'form.order.id.help',
         'help_translation_parameters' => [
             '%company%' => 'ACME Inc.',
-        ]
+        ],
     ]);
 
 The ``help_translation_parameters`` option of children fields is merged with the

reference/forms/types/options/label_translation_parameters.rst.inc

@@ -24,7 +24,7 @@ You can specify the placeholder values as follows::
         'label' => 'form.order.id',
         'label_translation_parameters' => [
             '%company%' => 'ACME Inc.',
-        ]
+        ],
     ]);
 
 The ``label_translation_parameters`` option of children fields is merged with