Update instructions for IPv6-enabled networks
Update instructions for IPv6-enabled networks

Signed-off-by: Joffrey F <2e95f49799afcec0080c0aeb8813776d949e0768@docker.com>

bdwill/docker.github.io,joaofnfernandes/docker.github.io,shin-/docker.github.io,anweiss/docker.github.io,docker-zh/docker.github.io,phiroict/docker,docker-zh/docker.github.io,docker/docker.github.io,sanscontext/docker.github.io,docker/docker.github.io,LuisBosquez/docker.github.io,JimGalasyn/docker.github.io,joeuo/docker.github.io,anweiss/docker.github.io,LuisBosquez/docker.github.io,anweiss/docker.github.io,joaofnfernandes/docker.github.io,docker-zh/docker.github.io,docker-zh/docker.github.io,JimGalasyn/docker.github.io,JimGalasyn/docker.github.io,shubheksha/docker.github.io,johnstep/docker.github.io,bdwill/docker.github.io,thaJeztah/docker.github.io,joaofnfernandes/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,shubheksha/docker.github.io,shin-/docker.github.io,JimGalasyn/docker.github.io,LuisBosquez/docker.github.io,thaJeztah/docker.github.io,shin-/docker.github.io,joeuo/docker.github.io,thaJeztah/docker.github.io,LuisBosquez/docker.github.io,anweiss/docker.github.io,docker/docker.github.io,docker/docker.github.io,docker/docker.github.io,docker-zh/docker.github.io,johnstep/docker.github.io,phiroict/docker,sanscontext/docker.github.io,shubheksha/docker.github.io,shubheksha/docker.github.io,shin-/docker.github.io,londoncalling/docker.github.io,bdwill/docker.github.io,phiroict/docker,johnstep/docker.github.io,sanscontext/docker.github.io,shubheksha/docker.github.io,bdwill/docker.github.io,thaJeztah/docker.github.io,LuisBosquez/docker.github.io,johnstep/docker.github.io,phiroict/docker,phiroict/docker,joeuo/docker.github.io,bdwill/docker.github.io,johnstep/docker.github.io,sanscontext/docker.github.io,shin-/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,joeuo/docker.github.io,joaofnfernandes/docker.github.io,sanscontext/docker.github.io,joaofnfernandes/docker.github.io,JimGalasyn/docker.github.io,joeuo/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io