Avoid history expansion.

Docker-DCO-1.1-Signed-off-by: Jeff Welch <whatthejeff@gmail.com> (github: whatthejeff)
Improve documentation on Ubuntu for getting the latest release of
docker.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Repaired broken links
Docker-DCO-1.1-Signed-off-by: Calin Cruceru <crucerucalincristian@gmail.com> (github: crucerucalin)
Merge pull request #6300 from whatthejeff/patch-1

Avoid history expansion.
Merge pull request #6315 from erikh/ubuntu-latest-install-docs

Improve documentation on Ubuntu for getting the latest release of docker.
Merge pull request #6322 from crucerucalin/master

Repaired broken links in docs/sources/faq.md