Update start-installation.md
Update start-installation.md

add quotation marks for "DocumentRoot" of apache config
yiisoft/yii2-app-advanced,vitezmiklos/test,subdee/myportugal,githubjeka/yii2-app-advanced,jgege/MonApp,tibrus/yii2-app-advanced,cophiel/YII2-Learning,yiisoft/yii2-app-advanced,nikbas/yii2-app-advanced,OneServices/OneCMS,Somefive/Athena,fredyns/yii2-boilerplate,jacmoe/yii2-app-advanced-zurbified,githubjeka/yii2-app-advanced,nikbas/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,dmitry-kulikov/yii2-app-advanced,cophiel/YII2-Learning,AnTAVR/yii2-app-advanced-ru,AnTAVR/yii2-app-advanced-ru,hiqsol/yii2-app-advanced,yiijan/yii2-app-advanced,erycamel/yii2-app-advanced,fredyns/yii2-boilerplate,Somefive/Athena,dixonsatit/yii2-dixon-starter,AnTAVR/yii2-app-advanced-ru,dixonsatit/yii2-dixon-starter,subdee/myportugal,jgege/MonApp,dmitry-kulikov/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,yiijan/yii2-app-advanced,jacmoe/yii2-app-advanced-zurbified,fredyns/yii2-boilerplate,erycamel/yii2-app-advanced,urmaul/yii2-app-advanced-mongodb