Updated multi-stage build reference (#3403)
Updated multi-stage build reference (#3403)

Removed reference to adding a Dockerfile.multi file as a required step.
johnstep/docker.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,shin-/docker.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,shubheksha/docker.github.io,shubheksha/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,shubheksha/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,shin-/docker.github.io,shin-/docker.github.io,shubheksha/docker.github.io,anweiss/docker.github.io,anweiss/docker.github.io,anweiss/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,anweiss/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,JimGalasyn/docker.github.io,johnstep/docker.github.io,docker/docker.github.io,shin-/docker.github.io,shubheksha/docker.github.io,johnstep/docker.github.io,thaJeztah/docker.github.io,shin-/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io