When using 'docker run -rm', volumes are deleted (v=1 in the DELETE request).

However, when running 'docker rm', volumes are not deleted by default, as matches the remote API behavior.

Especially as it is now default, I see the necessity of 'docker run -rm' deleting volumes by default. However, this behavior is not well-documented and inconsistent with 'docker rm'.

It may be necessary to change the default of 'docker rm', or simply improve the documentation as to highlight the behavioral differences.