doc: clarify where to get actool
doc: clarify where to get actool

yifan-gu/rkt,clearlinux/rkt,Wilybald/rkt,ybubnov/rkt,linki/rkt,kinvolk/rkt,il9ue/rkt,lee212/rkt,alexhersh/rkt,robszumski/rocket,eyakubovich/rkt,Shashwatsh/rkt,squeed/rkt,jjlakis/rkt,Wilybald/rkt,lee212/rkt,tv42/rkt,tv42/rkt,rot26/rkt,Wilybald/rkt,bsmr-go/rkt,robszumski/rocket,nhlfr/rkt,michelangelo13/rkt,krnowak/rkt,cab105/rkt,shobhit85/rkt,rot26/rkt,marineam/rkt,joshix/rkt,wparad/rkt,rkt/rkt,sstabellini/rkt,nhlfr/rkt,dgonyeo/rkt,s-urbaniak/rkt,blixtra/rkt,michelangelo13/rkt,mattthias/pkg-rkt,ybubnov/rkt,klizhentas/rkt,achanda/rkt,dalanlan/rkt,euank/rkt,s-urbaniak/rkt,tixxdz/rkt,linki/rkt,markllama/rkt,smarvin/rkt,liugenping/rkt,markllama/rkt,rkt/rkt,crawford/rkt,kbrwn/rkt,joshix/rkt,mjg59/rkt,MabinGo/rkt,liugenping/rkt,lsm5/rkt,akshaykarle/rkt,maquanyi/rkt,akshaykarle/rkt,xnox/rkt,eyakubovich/rkt,jjlakis/rkt,iankronquist/rkt,ChengTiesheng/rkt,sstabellini/rkt,coreos/rkt,intelsdi-x/rkt,ybubnov/rkt,ramitsurana/rkt,krnowak/rkt,joshix/rkt,MabinGo/rkt,maquanyi/rkt,ramitsurana05/rkt,fdserr/rkt,akshaykarle/rkt,adfernandes/rkt,alban/rkt,shtouff/rkt,tmrts/rkt,ChengTiesheng/rkt,klizhentas/rkt,liugenping/rkt,MattDees/rkt,ramitsurana/rkt,yifan-gu/rkt,squaremo/rkt,jasonchaffee/rkt,kbrwn/rkt,endocode/rkt,jzelinskie/rkt,il9ue/rkt,MabinGo/rkt,clearlinux/rkt,squeed/rkt,s-urbaniak/rkt,lsm5/rkt,cab105/rkt,rkt/rkt,gdi2290/rocket,lee212/rkt,Shashwatsh/rkt,luebken/rkt,bsmr-go/rkt,liubq919/rkt,bsmr-go/rkt,michelangelo13/rkt,fdserr/rkt,rhvgoyal/rkt,MattDees/rkt,Wilybald/rkt,yifan-gu/rkt,markllama/rkt,yifan-gu/rocket,MattDees/rkt,Yhgenomics/rkt,lucasallan/rkt,crawford/rkt,lsm5/rkt,dgonyeo/rkt,joshix/rkt,sstabellini/rkt,mike1729/rkt,euank/rkt,rot26/rkt,intfrr/rkt,Yhgenomics/rkt,jjlakis/rkt,iaguis/rkt,shobhit85/rkt,cab105/rkt,lucasallan/rkt,maquanyi/rkt,tmrts/rkt,shtouff/rkt,chrisseto/rkt,mattthias/pkg-rkt,intelsdi-x/rkt,lucasallan/rkt,jonboulle/rkt,euank/rkt,liubq919/rkt,dalanlan/rkt,yifan-gu/rocket,alban/rkt,monstermunchkin/rkt,ramitsurana05/rkt,endocode/rkt,matthaias/rkt,klizhentas/rkt,iaguis/rkt,blixtra/rkt,iankronquist/rkt,monstermunchkin/rkt,marineam/rkt,kinvolk/rkt,linki/rkt,chrisseto/rkt,blixtra/rkt,tixxdz/rkt,mjg59/rkt,dgonyeo/rkt,nhlfr/rkt,crawford/rkt,wparad/rkt,smarvin/rkt,coreos/rkt,sinfomicien/rkt,alban/rkt,jasonchaffee/rkt,rhvgoyal/rkt,matthaias/rkt,jasonchaffee/rkt,shobhit85/rkt,kbrwn/rkt,mike1729/rkt,squeed/rkt,mike1729/rkt,kinvolk/rkt,jakon89/rkt,krnowak/rkt,robszumski/rocket,mattthias/pkg-rkt,intfrr/rkt,jzelinskie/rkt,kinvolk/rkt,dalanlan/rkt,alexhersh/rkt,marineam/rkt,shtouff/rkt,sinfomicien/rkt,intelsdi-x/rkt,ChengTiesheng/rkt,adfernandes/rkt,squaremo/rkt,tv42/rkt,fdserr/rkt,xnox/rkt,clearlinux/rkt,jonboulle/rkt,gdi2290/rocket,smarvin/rkt,monstermunchkin/rkt,sgotti/rkt,Shashwatsh/rkt,Yhgenomics/rkt,il9ue/rkt,luebken/rkt,achanda/rkt,tmrts/rkt,endocode/rkt,eyakubovich/rkt,xnox/rkt,mjg59/rkt,jakon89/rkt,sgotti/rkt,wparad/rkt,yifan-gu/rocket,sgotti/rkt,rkt/rkt,chrisseto/rkt,ramitsurana/rkt,iaguis/rkt,squaremo/rkt,lucasallan/rkt,achanda/rkt,jzelinskie/rkt,alexhersh/rkt,jonboulle/rkt,liubq919/rkt,intfrr/rkt,ramitsurana05/rkt,jakon89/rkt,adfernandes/rkt,coreos/rkt,sinfomicien/rkt,luebken/rkt,matthaias/rkt,tixxdz/rkt,iankronquist/rkt,rhvgoyal/rkt