Fixes some docs issues with using single-dash arguments where they should be double

I found a bunch of issues where we have "-<opt>" instead of "--<opt>".
Also a couple of other issues, like "-notrunc", which is now "--no-trunc"
Fixes #5963

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #5965 from cpuguy83/5963-fix-single-dash-in-working-with-volumes

Fixes some docs issues with using single-dash arguments where they should be double