Update documentation for ServiceUpdate
Update documentation for ServiceUpdate

Currently, the behaviour for the version field in ServiceUpdate()
is vague. Without an correct version number, users are unable to
successfully run ServiceUpdate(), which is a pretty critical method
for scaling services (for example). I've just added an extra sentence
explaining what the version number is for, and where to find it.

Signed-off-by: Harrison Turton <2fb2659ffe9c0b67f7ff31af80e7e3aed35e21bd@gmail.com>

Mokolea/docker,nalind/docker,maxamillion/docker,maxamillion/docker,crosbymichael/docker,trebonian/docker,mikebrow/docker,mahak/docker,x1022as/docker,pradipd/moby,rancher/docker,justincormack/docker,KarthikNayak/docker,konstruktoid/docker-upstream,tmp6154/docker,jimjag/docker,moul/docker,rancher/docker,yosifkit/docker,jvanz/docker,paralin/docker,cpuguy83/docker,laijs/docker,tmp6154/docker,rremer/moby,yosifkit/docker,justincormack/docker,jthelin/docker,docker/docker,jameszhan/docker,SvenDowideit/docker,bearstech/moby,djs55/docker,YuPengZTE/docker,moul/docker,tmp6154/docker,konstruktoid/docker-1,cpuguy83/docker,yongtang/docker,dmcgowan/docker,jlhawn/docker,jimjag/docker,bearstech/moby,laijs/moby,thaJeztah/docker,pradipd/moby,jwhonce/docker,jameszhan/docker,ibuildthecloud/docker,jvanz/docker,estesp/docker,estesp/docker,vdemeester/docker,jimjag/docker,paralin/docker,rremer/moby,Mokolea/docker,jthelin/docker,laijs/docker,mahak/docker,kolyshkin/moby,flavio/docker,ibuildthecloud/docker,SvenDowideit/docker,rancher/docker,nalind/docker,paralin/docker,Ramzec/docker,scotttlin/docker,yongtang/docker,unclejack/docker,bearstech/moby,yongtang/docker,laijs/docker,AkihiroSuda/docker,gnailuy/docker,Mokolea/docker,nawawi/docker,AkihiroSuda/docker,docker/docker,laijs/moby,vdemeester/docker,estesp/docker,mikebrow/docker,jlhawn/docker,nalind/docker,konstruktoid/docker-upstream,kojiromike/docker,jimjag/docker,YuPengZTE/docker,flavio/docker,KarthikNayak/docker,trebonian/docker,thaJeztah/docker,kolyshkin/docker,konstruktoid/docker-1,djs55/docker,flavio/docker,konstruktoid/docker-1,gnailuy/docker,cpuguy83/docker,jvanz/docker,Ramzec/docker,kolyshkin/docker,moby/moby,x1022as/docker,yosifkit/docker,moby/moby,ibuildthecloud/docker,trebonian/docker,pradipd/moby,scotttlin/docker,thaJeztah/docker,Ramzec/docker,jameszhan/docker,Ramzec/docker,scotttlin/docker,nawawi/docker,djs55/docker,mahak/docker,kolyshkin/moby,ibuildthecloud/docker,dmcgowan/docker,unclejack/docker,Mokolea/docker,gnailuy/docker,moby/moby,konstruktoid/docker-upstream,gnailuy/docker,unclejack/docker,AkihiroSuda/docker,moul/docker,thaJeztah/docker,justincormack/docker,cpuguy83/docker,kojiromike/docker,SvenDowideit/docker,docker/docker,dims/docker,dims/docker,AkihiroSuda/docker,jwhonce/docker,crosbymichael/docker,jlhawn/docker,mikebrow/docker,konstruktoid/docker-upstream,moul/docker,yosifkit/docker,KarthikNayak/docker,dims/docker,nawawi/docker,x1022as/docker,nawawi/docker,flavio/docker,paralin/docker,rremer/moby,YuPengZTE/docker,nalind/docker,jwhonce/docker,maxamillion/docker,vdemeester/docker,ibuildthecloud/docker,dmcgowan/docker,bearstech/moby,kolyshkin/moby,trebonian/docker,mahak/docker,kojiromike/docker,laijs/moby,moby/moby,crosbymichael/docker