Docker container page look incompletely

[Eji4h]

Docker container page now incompletely and I think it can improve

• docker cp command not completely, missing arguments for a copy to source path and destination path.
• docker exec should be more examples with frequently use options.
• docker container not only works with container id it can be used with container name. etc.

[surrealist]

Sound good.

[dmakeroam]

@Eji4h I'll do it soon.