clean man lint warnings in sbin/

[yuripv_gmx.com]

Summary

Cleanup warnings reported by mandoc -Tlint -Wwarning for sbin/.

[yuripv_gmx.com]

correctly use .Sm macro in sconfig.8.

[bcr]

Looks OK to me, thanks for working on that. Who's going to commit those?

[bjk]

Who's going to commit those?

@bcr I think you have implicitly volunteered to do so.

[bcr]

I have no time this weekend. I'd appreciate it if someone else could take this on.

[bcr]

Most, if not all of these have been fixed by now. So, I'm closing this review.
Thank you for submitting these changes, anyway. Keep it up!