documentation corrections [skip ci]

README.md

@@ -70,7 +70,7 @@ we suggest using [our logo](http://www.yiiframework.com/logo/) on your title sli
 **In projects**
 
 If you are using Yii 2 as part of an OpenSource project, a way to acknowledge it is to
-[use a special badge](URL https://img.shields.io/badge/Powered_by-Yii_Framework-green.svg?style=flat) in your README:    
+[use a special badge](https://img.shields.io/badge/Powered_by-Yii_Framework-green.svg?style=flat) in your README:    
 
 ![Yii2](https://img.shields.io/badge/Powered_by-Yii_Framework-green.svg?style=flat)
 

docs/guide/input-file-upload.md

@@ -166,7 +166,7 @@ use yii\widgets\ActiveForm;
 
 <?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]) ?>
 
-    <?= $form->field($model, 'imageFiles')->fileInput(['multiple' => true]) ?>
+    <?= $form->field($model, 'imageFiles[]')->fileInput(['multiple' => true, 'accept' => 'image/*']) ?>
 
     <button>Submit</button>
 

docs/guide/structure-applications.md

@@ -106,10 +106,10 @@ you may list its ID as an element in this property.
 
 Each component listed in this property may be specified in one of the following formats:
 
-- an application component ID as specified via [components](#components).
-- a module ID as specified via [modules](#modules).
-- a class name.
-- a configuration array.
+- an application component ID as specified via [components](#components),
+- a module ID as specified via [modules](#modules),
+- a class name,
+- a configuration array,
 - an anonymous function that creates and returns a component.
 
 For example:
@@ -215,7 +215,7 @@ Each application component is specified as a key-value pair in the array. The ke
 while the value represents the component class name or [configuration](concept-configurations.md).
 
 You can register any component with an application, and the component can later be accessed globally
-using the expression `\Yii::$app->ComponentID`.
+using the expression `\Yii::$app->componentID`.
 
 Please read the [Application Components](structure-application-components.md) section for details.