Fix link anchors in CONTRIBUTING.md
Fix link anchors in CONTRIBUTING.md

This is a follow up of #35168.

Signed-off-by: Yuichiro Kaneko <37b8411fc533112bb69dd1aa56980922c21ae5e0@gmail.com>

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