Revision 210771

MFC r210511:

Use "printf" instead of "echo -n" in an example because it
should be more compatible for most shells that are out there.

I contacted Philip Guenther at OpenBSD about this PR and he
corrected the issue in their tree pretty fast.

PR:                 docs/142243
Submitted by:       Yasir (yasir27 at mail dot ru)
Obtained from:      OpenBSD
Discussed with:     delphij