Add note about POWERLINE_COMMAND to documentation
Add note about POWERLINE_COMMAND to documentation


magus424/powerline,wfscheper/powerline,S0lll0s/powerline,seanfisk/powerline,russellb/powerline,darac/powerline,EricSB/powerline,firebitsbr/powerline,Luffin/powerline,bezhermoso/powerline,DoctorJellyface/powerline,russellb/powerline,wfscheper/powerline,junix/powerline,cyrixhero/powerline,junix/powerline,QuLogic/powerline,s0undt3ch/powerline,bartvm/powerline,s0undt3ch/powerline,seanfisk/powerline,areteix/powerline,magus424/powerline,cyrixhero/powerline,Liangjianghao/powerline,areteix/powerline,keelerm84/powerline,russellb/powerline,seanfisk/powerline,blindFS/powerline,areteix/powerline,S0lll0s/powerline,xfumihiro/powerline,EricSB/powerline,dragon788/powerline,xxxhycl2010/powerline,DoctorJellyface/powerline,darac/powerline,dragon788/powerline,IvanAli/powerline,EricSB/powerline,prvnkumar/powerline,DoctorJellyface/powerline,kenrachynski/powerline,blindFS/powerline,blindFS/powerline,bezhermoso/powerline,xxxhycl2010/powerline,xfumihiro/powerline,QuLogic/powerline,xxxhycl2010/powerline,firebitsbr/powerline,s0undt3ch/powerline,magus424/powerline,kenrachynski/powerline,prvnkumar/powerline,cyrixhero/powerline,prvnkumar/powerline,lukw00/powerline,xfumihiro/powerline,Liangjianghao/powerline,Liangjianghao/powerline,junix/powerline,Luffin/powerline,lukw00/powerline,kenrachynski/powerline,dragon788/powerline,keelerm84/powerline,IvanAli/powerline,bezhermoso/powerline,wfscheper/powerline,bartvm/powerline,bartvm/powerline,IvanAli/powerline,S0lll0s/powerline,firebitsbr/powerline,lukw00/powerline,Luffin/powerline,darac/powerline,QuLogic/powerline