Fix embarrassing debootstrap typo :)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #6037 from tianon/fix-debootstrap-typo

Fix embarrassing debootstrap typo :)
Dockerfile.5.md stub
Properly formatted DCO:
Docker-DCO-1.1-Signed-off-by: Zac Dover <zdover@redhat.com> (github: zdover23)

Docker-DCO-1.1-Signed-off-by: Zac Dover <zdover@redhat.com> (github: )
Merge pull request #6039 from zdover23/26May_dockerfile

Dockerfile.5.md stub
Adding User Guide

* Added User Guide section outlines.
* Moved HTTPS example to articles.
* Replaced Hello World example with User Guide.
* Moved use cases out of examples.
* Updated Introduction to add User Guide
* Added Docker.io section
* Added Dockerized section
* Added Using Docker section
* Added Docker Images section

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)