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Use printf instead of echo because echo flags are undefined

Craig Andrews requested to merge candrews/gitlab:printf into master

What does this MR do and why?

This MR is a simple documentation update.

In POSIX, "echo" flags are undefined so using "echo -n" in the documentation may not work on all user's systems. To mitigate this concern, use printf which always works.

See: https://www.shellcheck.net/wiki/SC3037

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