[skip ci] Add the `advanced-app-configs.png` image file for tutorial docs/guide-ru...

Docs guide ja rest finished [ci skip]

typos

Docs guide ja rest update [ci skip]

fixes #6682

close #6680

docs-guide-ja-output updates [ci skip]

Fixes #6678: `yii\behaviors\SluggableBehavior` will generate a new slug only when the slug attribute is empty or the source attribute is changed

Docs guide ja rest controllers [ci skip]

Docs guide ja rest resources [ci skip]

Update intro-yii.md in guide-es [skip ci]

Update BaseArrayHelper.php