Update docs for Digital Ocean driver
Update docs for Digital Ocean driver

Signed-off-by: Koichi Shiraishi <41a18128582fec5418c0a92661f7d4b13d21d912@gmail.com>

titanlien/machine,robinbb/machine,joaofnfernandes/docker.github.io,evq/machine,alexisbellido/docker.github.io,carolynvs/machine,j3tm0t0/machine,anshulr/machine,voutilad/machine,bdwill/docker.github.io,allingeek/machine,sanscontext/docker.github.io,gdevillele/docker.github.io,carolynvs/machine,titanlien/machine,schatt/machine,cpuguy83/machine,wzymaster/machine,hypriot/machine,thaJeztah/machine,Herbis/machine,pottava/machine,seegno-forks/machine,tpires/machine,atsaki/machine-2,otherjason/machine,davidstosik/machine,surgeforward/machine,sanscontext/docker.github.io,jeanlaurent/machine,robertbreker/machine,frapposelli/machine,sjfloat/machine,sebadiaz/machine,jkingyens/machine,usmanismail/machine,atsaki/machine-2,gdevillele/docker.github.io,cab105/machine,bwahn/machine,jzwlqx/denverdino.github.io,LuisBosquez/docker.github.io,aduermael/docker.github.io,LaynePeng/machine,hypriot/machine,jkingyens/machine,whilp/machine,LuisBosquez/docker.github.io,denverdino/machine,ddaze/machine,joyent/machine,abstractitptyltd/machine,danix800/docker.github.io,xiaohui/machine,thaJeztah/docker.github.io,bfirsh/machine,anweiss/docker.github.io,askb/machine,usmanismail/machine,joeuo/docker.github.io,robvanmieghem/machine,LuisBosquez/docker.github.io,moxiegirl/machine,emsi/machine,errordeveloper/machine,dudymas/machine,londoncalling/docker.github.io,docker/docker.github.io,sjfloat/machine,dskora/machine,vovimayhem/machine,feelobot/machine,amylindburg/machine,troy0820/docker.github.io,pdxjohnny/machine,shin-/docker.github.io,atsaki/machine,shubheksha/docker.github.io,Herbis/machine,atsaki/machine,carolynvs/machine,duglin/machine,jlusiardi/machine,jmelis/machine,Parallels/docker-machine,jzwlqx/denverdino.github.io,ehazlett/machine,databus23/machine,menglingwei/machine,jhoos/machine,otherjason/machine,phiroict/docker,vovimayhem/machine,LaynePeng/machine,rowancarr/machine,cab105/machine,Grynn/machine,docker/docker.github.io,ubiquityhosting/machine,joelea/machine,menglingwei/denverdino.github.io,londoncalling/machine,phiroict/docker,wlan0/machine,denverdino/docker.github.io,shot/machine,jsirois/machine,beni55/machine,bgokden/machine,rillig/docker.github.io,dskora/machine,ksasi/machine,Kast0rTr0y/docker-machine,kunalkushwaha/machine,jzwlqx/denverdino.github.io,cpuguy83/machine,jgsqware/machine,anweiss/docker.github.io,bookerzzz/machine,pottava/machine,blueyed/machine,denverdino/machine-1,errordeveloper/machine,joeuo/docker.github.io,jlusiardi/machine,londoncalling/docker.github.io,otherjason/machine,bookerzzz/machine,tpires/machine,denverdino/denverdino.github.io,juliengarcia/machine,shubheksha/docker.github.io,JimGalasyn/docker.github.io,menglingwei/machine,askb/machine,moxiegirl/machine,miqui/machine,thaJeztah/machine,pdxjohnny/machine,erikdejonge/machine,alindeman/machine,mjtrefethen/machine,ppadala/machine,dweomer/docker-machine,anshulr/machine,cvstebut/machine,denmat/machine,rillig/docker.github.io,ppadala/machine,errordeveloper/machine,johnstep/docker.github.io,slowteetoe/machine,cgvarela/machine,titanlien/machine,voutilad/machine,cvstebut/machine,MHBauer/machine,menglingwei/denverdino.github.io,trecloux/machine,schatt/machine,ekristen/machine,denverdino/denverdino.github.io,legal90/machine,rawkode/machine,Kast0rTr0y/docker-machine,docker/docker.github.io,j3tm0t0/machine,zchee/machine,dudymas/machine,skatsuta/machine,abstractitptyltd/machine,denverdino/machine,LuisBosquez/docker.github.io,wenlock/machine,StackPointCloud/machine,sausheong/machine,tyrken/machine,sjfloat/machine,kacole2/machine,skippbox/kmachine,whilp/machine,binario200/machine,steeve/machine,menglingwei/denverdino.github.io,aduermael/docker.github.io,CenturyLinkLabs/machine,denverdino/docker.github.io,pragkent/machine,jeffellin/machine,NeilW/machine,ksasi/machine,johnstep/docker.github.io,thaJeztah/docker.github.io,xinxian0458/machine,shubheksha/docker.github.io,gerred/machine,jeanlaurent/machine,sebadiaz/machine,larsla/machine,JohnKDay/machine,shot/machine,emsi/machine,carloreggiani/machine,pdxjohnny/machine,carloreggiani/machine,surgeforward/machine,TrumanLing/machine,hironobu-s/machine,soleo/machine,denverdino/docker.github.io,aduermael/docker.github.io,londoncalling/docker.github.io,frapposelli/machine,alexisbellido/docker.github.io,jkingyens/machine,alindeman/machine,wlan0/machine,SvenDowideit/machine,cab105/machine,OpenNebula/machine,faijaz/docker-machine,allingeek/machine,gdevillele/docker.github.io,londoncalling/machine,askb/machine,troy0820/docker.github.io,vovimayhem/machine,faijaz/docker-machine,beni55/machine,mjtrefethen/machine,deitch/machine,johnstep/docker.github.io,jhoos/machine,JimGalasyn/docker.github.io,ksasi/machine,atsaki/machine,duglin/machine,robertbreker/machine,ekristen/machine,pragkent/machine,jarosser06/machine,rowancarr/machine,BSWANG/denverdino.github.io,thaJeztah/machine,yut148/machine,databus23/machine,docker-zh/docker.github.io,ubiquityhosting/machine,ehazlett/machine,alexisbellido/docker.github.io,denverdino/machine-1,shubheksha/docker.github.io,steeve/machine,yanzay/machine,SvenDowideit/machine,jhoos/machine,joaofnfernandes/docker.github.io,marsmensch/machine,imikushin/machine,menglingwei/denverdino.github.io,danix800/docker.github.io,jsirois/machine,unodba/machine,kechol/machine,joeuo/docker.github.io,skatsuta/machine,jeanlaurent/machine,jasisk/machine,tyrken/machine,13W/machine,asalhamed/machine,ocean/machine,bdwill/docker.github.io,justintung/machine,kacole2/machine,dnephin/machine,docker-zh/docker.github.io,jzwlqx/denverdino.github.io,shin-/docker.github.io,TrumanLing/machine,jgsqware/machine,alexisbellido/docker.github.io,skippbox/kmachine,jlusiardi/machine,nunofgs/docker-machine,ocean/machine,xiaohui/machine,sanscontext/docker.github.io,anweiss/docker.github.io,BSWANG/denverdino.github.io,usmanismail/machine,ggiamarchi/machine,feelobot/machine,bdwill/docker.github.io,wzymaster/machine,rwilliams/machine,thaJeztah/docker.github.io,jpressnell/machine,denverdino/docker.github.io,jarosser06/machine,joaofnfernandes/docker.github.io,docker-zh/docker.github.io,gdevillele/docker.github.io,pottava/machine,rillig/docker.github.io,imikushin/machine,rwilliams/machine,ubiquityhosting/machine,rdgreis/machine,phiroict/docker,BSWANG/denverdino.github.io,rillig/docker.github.io,rupakg/machine,aduermael/docker.github.io,csakoda/machine,brandoncc/machine,cvstebut/machine,yanzay/machine,jmelis/machine,rwilliams/machine,jzwlqx/denverdino.github.io,asalhamed/machine,soleo/machine,laveolu/machine,docker/machine,londoncalling/docker.github.io,jeffellin/machine,rupakg/machine,jgsqware/machine,tpires/machine,BSWANG/denverdino.github.io,shin-/docker.github.io,ppadala/machine,dgageot/machine,johnstep/docker.github.io,seegno-forks/machine,legal90/machine,soleo/machine,gerred/machine,docker/docker.github.io,slashk/machine,xinxian0458/machine,thaJeztah/docker.github.io,CenturyLinkLabs/machine,csakoda/machine,bwahn/machine,xiaohui/machine,menglingwei/denverdino.github.io,akolpakov/machine,wlan0/machine,slashk/machine,ddaze/machine,bgokden/machine,alexisbellido/docker.github.io,joaofnfernandes/docker.github.io,zchee/machine,13W/machine,bfirsh/machine,robvanmieghem/machine,erikdejonge/machine,zchee/machine,jeffellin/machine,bwahn/machine,dudymas/machine,nunofgs/docker-machine,danix800/docker.github.io,NeilW/machine,databus23/machine,juliengarcia/machine,bookerzzz/machine,beni55/machine,dweomer/docker-machine,phiroict/docker,StackPointCloud/machine,aperepel/machine,aperepel/machine,deitch/machine,ibuildthecloud/machine,kacole2/machine,robvanmieghem/machine,flavio/machine,jasisk/machine,JimGalasyn/docker.github.io,robinbb/machine,allingeek/machine,kunalkushwaha/machine,docker-zh/docker.github.io,trecloux/machine,bdwill/docker.github.io,tyrken/machine,hironobu-s/machine,rdgreis/machine,flavio/machine,kunalkushwaha/machine,shot/machine,miqui/machine,docker/machine,cgvarela/machine,LuisBosquez/docker.github.io,denverdino/denverdino.github.io,euank/machine,wenlock/machine,JimGalasyn/docker.github.io,menglingwei/machine,troy0820/docker.github.io,denmat/machine,thaJeztah/docker.github.io,OpenNebula/machine,akolpakov/machine,jpressnell/machine,exoscale/docker-machine,wenlock/machine,denverdino/docker.github.io,troy0820/docker.github.io,exoscale/docker-machine,bgokden/machine,slowteetoe/machine,jmelis/machine,dmp42/machine,bdwill/docker.github.io,Grynn/machine,OpenNebula/machine,laveolu/machine,evq/machine,davidstosik/machine,denverdino/denverdino.github.io,blueyed/machine,miqui/machine,BSWANG/denverdino.github.io,binario200/machine,MHBauer/machine,gerred/machine,jsirois/machine,joelea/machine,davidstosik/machine,sanscontext/docker.github.io,londoncalling/docker.github.io,pragkent/machine,StackPointCloud/machine,faijaz/docker-machine,shin-/docker.github.io,anweiss/docker.github.io,NeilW/machine,joaofnfernandes/docker.github.io,danix800/docker.github.io,moxiegirl/machine,euank/machine,joeuo/docker.github.io,mark-adams/machine,kechol/machine,xinxian0458/machine,joyent/machine,crunchywelch/machine,juliengarcia/machine,Grynn/machine,yut148/machine,Parallels/docker-machine,docker/docker.github.io,crunchywelch/machine,johnstep/docker.github.io,dgageot/machine,denverdino/denverdino.github.io,paultag/machine,JimGalasyn/docker.github.io,sebadiaz/machine,hironobu-s/machine,clintonskitson/machine,robertbreker/machine,paultag/machine,clintonskitson/machine,larsla/machine,shubheksha/docker.github.io,rawkode/machine,rowancarr/machine,ibuildthecloud/machine,unodba/machine,mark-adams/machine,shin-/docker.github.io,gdevillele/docker.github.io,sanscontext/docker.github.io,wzymaster/machine,JohnKDay/machine,anweiss/docker.github.io,amylindburg/machine,denverdino/machine,JohnKDay/machine,dmp42/machine,justintung/machine,trecloux/machine,ggiamarchi/machine,docker-zh/docker.github.io,brandoncc/machine,marsmensch/machine,dnephin/machine,joeuo/docker.github.io,skatsuta/machine,phiroict/docker,sausheong/machine,yanzay/machine