Update docker-compose run --rm doc (#6803)
Update docker-compose run --rm doc (#6803)

* Update docker-compose run --rm doc

To make the functionality added in
https://github.com/funkyfuture/docker-compose/commit/24ab933ebfd3169491beeb18f0041cabebe4d2d2
explicit in the docs

* Rewrite change as an addendum

Rewrite the change to the end of the page as an addendum to the description of the inner workings of the run command.

anweiss/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,anweiss/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,anweiss/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,johnstep/docker.github.io,docker/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,johnstep/docker.github.io