Fix typo in rcsh support documentation
Fix typo in rcsh support documentation

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