Simplify and add comments in docs dockerfile
Simplify and add comments in docs dockerfile

BWITS/seagull,YankunLi/seagull,tobegit3hub/seagull,tobegit3hub/seagull,tobegit3hub/seagull,xiongjungit/seagull,BWITS/seagull,AlphaStaxLLC/seagull,Cepave/seagull,tobegit3hub/seagull,ycaihua/seagull,ycaihua/seagull,xiongjungit/seagull,AlphaStaxLLC/seagull,AlphaStaxLLC/seagull,YankunLi/seagull,xiongjungit/seagull,ycaihua/seagull,Cepave/seagull,BWITS/seagull,BWITS/seagull,YankunLi/seagull,ycaihua/seagull,AlphaStaxLLC/seagull,xiongjungit/seagull,Cepave/seagull,Cepave/seagull,YankunLi/seagull