Fix detaching from attached container

Text was copied from man-pages https://raw.githubusercontent.com/docker/docker/master/docs/man/docker-attach.1.md

Signed-off-by: Jyrki Puttonen <jyrkiput@gmail.com>
Cleanup: Fix cli docs: Sorted command headers.

Signed-off-by: Andrey Petrov <andrey.petrov@shazow.net>
Merge pull request #8151 from shazow/sort-exec-docs

Cleanup: Fixed cli docs' command header sorting
Merge pull request #8124 from jyrkiput/patch-1

Fix detaching from attached container