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

[skip ci] Internal es

Update Guide ES [skip ci]

miss blank

Fix reference sections Url

Fixes #6589: updated code style guide to mention else after return, adjusted code involved in the issue