Update input-forms.md

docs/guide/input-forms.md

@@ -114,7 +114,7 @@ to the attribute name:
 
 ```php
 // allow multiple files to be uploaded:
-echo $form->field($model, 'uploadFile[]')->fileInput('multiple'=>'multiple');
+echo $form->field($model, 'uploadFile[]')->fileInput(['multiple'=>'multiple']);
 
 // allow multiple items to be checked:
 echo $form->field($model, 'items[]')->checkboxList(['a' => 'Item A', 'b' => 'Item B', 'c' => 'Item C']);