Change 'Uploading context' wording

Docker-DCO-1.1-Signed-off-by: Ryan Stelly <ryan.stelly@live.com> (github: FLGMwt)
implement wait on freeze

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6082 from FLGMwt/2342-change-wording-uploading-context

Change 'Uploading context' wording
Update builder.md
Merge pull request #6191 from snowch/patch-1

Small clarification
Merge pull request #6187 from vieux/wait_freeze

Implement wait on freeze
Add ability to pause/unpause containers via cgroups freeze

This patch adds pause/unpause to the command line, api, and drivers
for use on containers.  This is implemented using the cgroups/freeze
utility in libcontainer and lxc freeze/unfreeze.

Co-Authored-By: Eric Windisch <ewindisch@docker.com>
Co-Authored-By: Chris Alfonso <calfonso@redhat.com>
Docker-DCO-1.1-Signed-off-by: Ian Main <imain@redhat.com> (github: imain)
Integrating systemd freeze functionality.

This pulls together #6061 and #6125

Docker-DCO-1.1-Signed-off-by: Chris Alfonso <calfonso@redhat.com> (github: calfonso)