This fix updates the markdown for man pages of `docker container ...`
so that they are consistent. The changes are based on feedback:
https://github.com/docker/docker/pull/30645#discussion_r99020188
https://github.com/docker/docker/pull/30645#discussion_r99020304
1. Use `H2 (##)` as needed
2. Use unrpiviledged prompt (`$`) instead of (`#`)
This PR convers files under man/src/container/*.md
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: b8b156f343
Component: cli