docs/guide-ja/structure-environments.md improved wordings [ci skip]
docs/guide-ja/structure-environments.md improved wordings [ci skip]

cophiel/YII2-Learning,githubjeka/yii2-app-advanced,dixonsatit/yii2-dixon-starter,githubjeka/yii2-app-advanced,erycamel/yii2-app-advanced,urmaul/yii2-app-advanced-mongodb,AnTAVR/yii2-app-advanced-ru,yiijan/yii2-app-advanced,yiijan/yii2-app-advanced,subdee/myportugal,jgege/MonApp,mobilejazz/yii2-mj-cms-example,AnTAVR/yii2-app-advanced-ru,yiisoft/yii2-app-advanced,jgege/MonApp,Somefive/Athena,vitezmiklos/test,tibrus/yii2-app-advanced,dixonsatit/yii2-dixon-starter,erycamel/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,subdee/myportugal,nikbas/yii2-app-advanced,cophiel/YII2-Learning,AnTAVR/yii2-app-advanced-ru,Somefive/Athena,dmitry-kulikov/yii2-app-advanced,yiisoft/yii2-app-advanced,dmitry-kulikov/yii2-app-advanced,nikbas/yii2-app-advanced