Update the multi-stage builds Docker concept to not require Java

[sbenhoff007]

Page to update: https://docs.docker.com/get-started/docker-concepts/building-images/multi-stage-builds/)

This page uses a hands-on exercise that requires Java. @dvdksn has requested that we rewrite this concept so that Java is not required.

[dvdksn]

cc @ajeetraina could you PTAL at this one

[ajeetraina]

Look like Java is not a prerequisite here. I have raised the PR

[docker-robot]

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