Documented resizing of container's pseudo-TTY

Docker-DCO-1.1-Signed-off-by: Paris Kasidiaris <pariskasidiaris@gmail.com> (github: parisk)
Polished TTY resizing documentation

  - Removed query parameters from endpoint
  - Added query parameters to request example
  - Fixed request example URL
  - Removed content-type from request example

Docker-DCO-1.1-Signed-off-by: Paris Kasidiaris <pariskasidiaris@gmail.com> (github: parisk)
Merge pull request #4820 from sourcelair/docs

Documented container TTY resizing