Update builder.md
(cherry picked from commit 831066337743fc29ff122fce51afe44b8b3b3ba9)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit bc66821abbcf50c721ce9b8f52b339fda102d389)
Signed-off-by: Tibor Vass <tibor@docker.com>
Upstream-commit: 7955683eb2
Component: cli