* Added pretty print support to Json helper
* Updated documentation for `yii\helpers\Json::$prettyPrint`
* Fixed line ending in \yiiunit\framework\helpers\JsonTest::testPrettyPrint for windows
* Added helper-json.md link in docs/guide/README.md
* Capitalized JSON in descriptions
Co-authored-by: Alexander Makarov <sam@rmcreative.ru>
Co-authored-by: Alexander Makarov <sam@rmcreative.ru>
Co-authored-by: Bizley <pawel@positive.codes>