How do you generate the API and YII2 DOCS ?

Hello Yii people,How do you generate the API and YII2 DOCS so that it can be viewed offline…I tried to follow the instruction in GITHUB but I could not understand…I already successfully installed the composer-setup.exe in my windows 8 machine.After that I don’t know what to do next.I hope someone can help me how to put this API and YII2 DOCS in offline.

More help greatly appreciated.

Thank you in advance.