Fix#17927.
Instead of pointing to a file in Docker's GitHub repo on `master`
(which got renamed, breaking the link), point to a specific version
(the current latest). As a bonus, we now highlight the most
relevant lines, without becoming more fragile.
Signed-off-by: Paolo G. Giarrusso <p.giarrusso@gmail.com>
Upstream-commit: 6b02876362680a1acd2c0fb1fdd85183cee03f20
Component: engine