adding note that host-volumes must be defined using absolute paths

Docker-DCO-1.1-Signed-off-by: Will Weaver <monkey@buildingbananas.com> (github: funkymonkeymonk)
DOC: Fix switch name for tagging images in build command

Docker-DCO-1.1-Signed-off-by: German Del Zotto <germ@ndz.com.ar> (github: GermanDZ)
Merge pull request #4410 from 1uptalent/fix_typo_in_build_command_doc

DOC: Fix switch name for tagging images in build command
Merge pull request #4406 from funkymonkeymonk/voldocs

adding note that host-volumes must be defined using absolute paths